Sylpheed/docs/port/DECISIONS.md

Decisions

One entry per decision that outlives the container it was made in. Newest last. A decision that lives only in an agent's context is lost when that container dies, which is what this file is for.

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P0 — the exporter, 2026-08-28

The exporter reads one authored file, and stamps its provenance into the output

export/ is derived and authored/ is hand-written, and the natural reading of that is that the exporter never touches authored/. But a screen has to be called something, and the disc does not name its builds — the identification of build 5 as the main menu is HANDOFF Q2, measured against a live capture, not a field.

Two ways to handle that:

1. the exporter emits build_05.json and the runtime renames it from authored/screen_names.json;
2. the exporter reads that map and writes main_menu.json directly.

Chose 2, with a condition: every name it applies carries name_source: "authored" and a name_why quoting the evidence, and check rejects an authored name with no why. The file that lands in export/ is therefore still honest about which of its fields is a measurement — which is the property the derived/authored split exists to protect — while a human opening the tree sees main_menu.json rather than having to resolve a rename in their head. A build nobody has identified exports as build_NN with name_source: "index", which is a locator and not a claim.

This is the only authored input the exporter takes. Everything else in authored/ is applied by the runtime over export/.

Sprites are per screen, not a flat pool

main_menu and extras both ship a ptbase.t32 and they are different pictures. A flat sprites/ directory would have silently collided; whichever screen exported second would have won, and the loser would have drawn the wrong background with no error anywhere. sprites/<subdir>/<screen>/<name>.png.

The format is executable

sylpheed-export check --out export validates a tree against docs/FORMAT.md with no disc in hand. It exists because "the export is correct" is otherwise an assertion, and because the P0 gate is "validates against FORMAT.md" — which is not a thing anyone can confirm by reading.

It reads the tree the way Godot will: as a stranger, with no access to the disc, the decoders, or the exporter's internals. It deliberately does not check the export against the disc — that is what sylpheed-cli screen render is for, at P1.

Checked that it bites, rather than assuming: five mutations of a valid main_menu.json — a broken paint_order permutation, a dangling focus_sprite, a reversed buttons list, a #rrggbbaa colour, an invented name_source — are each caught with a specific message.

The highlight sprite pairs by name; opt is exported but not believed

FORMAT v1 said focus_sprite came from the element's opt link. That reading was measured and refuted by the RE agent, and this export shows why plainly: on the main menu, opt chains ptloop01 → ptloop02 → ptbtn01 — two decorations and then a button. It is a linked list of something, and it is not focus.

The highlight is paired by sprite name instead (ptbtn01.t32 ↔ ptbtn01f.t32), which is HANDOFF's convention and holds for all 54 real pairs on the disc. It resolves all five main-menu buttons. The raw link is still exported as opt_link, renamed so that nothing downstream mistakes it for navigation, and so that whoever eventually decodes it has the data.

Note this is 🟡 a naming convention, not a decoded field. It is authored in effect, and lives in the exporter only because it is a rule over disc data rather than a value we chose.

The paint order is exported, not authored

Q3 decoded it — a u16 layer key at +0x0A of each T8aD sprite header, stable-sorted with declaration index. So it is read in the exporter, per the contract's own rule for a decoded answer, and paint_order in export/ is a derived field. "paint_order" is gone from unresolved; paint_order_ties replaces it, because the tie-break is still unknown and costs one element's blend on one screen.

Where an element has no T8aD header the key comes from the decoders' table of keys measured off the running game. That is a different kind of fact, so it is labelled: layer_source is "sprite", "implied" or "none", and a consumer that needs to know whether a layer is read or measured can tell.

Colours are exported as two fields with the byte order in the name

There are two modulate colours and they multiply: tint is RGBA, fade is ARGB and its high byte is the alpha that ramps. v1's single "#ffffffff" could not carry both and silently discarded the ramping alpha. They are exported as tint_rgba and fade_argb, raw hex, byte order in the key — because getting it backwards is silent and looks like an art bug rather than a parse bug.

t stays raw

HANDOFF Q1 is answered — linear ramp, 2 units per rendered frame, working conversion 1 unit = 1/60 s — but that conversion is measured off the running game, not read from the file, and the finding itself flags the 27.6 present- frames/second measurement as the part worth re-testing. If the game turns out to present at 60 Hz, every duration halves.

So t is exported exactly as the disc spells it, keyframe_time_unit stays in unresolved, and the conversion will live in one authored place at P2. One constant to change, in a file that says it is a decision.

The final keyframe has no t, and check enforces that

The disc has no time slot on the last keyframe of a group. A file that carries one there has invented it. check rejects it — this is the one place where the temptation to emit a plausible number is strongest and the resulting error is completely invisible.

---

P1 — Godot draws the screen, 2026-08-28

The Godot side reads the manifest, not a path

ExportTree is the only class that knows where export/ is: SYLPHEED_EXPORT if set, otherwise <project>/../export. Screens are addressed by their manifest name (main_menu), never by a file path, so the runtime never encodes the archive's subdirectory and a re-export that moves a file does not break it. It also checks format on both the manifest and each screen, and refuses a tree it was not built to read rather than half-drawing one.

Textures are read as bytes and decoded with load_png_from_buffer at runtime. They are deliberately not Godot-imported resources: export/ is gitignored and regenerated wholesale, and a .import sidecar per sprite would be derived state living next to derived state, invalidated on every re-export.

One CanvasItem draws the whole screen

ScreenView._draw walks paint_order and draws each element itself, rather than making a node per element and leaning on z_index. The export's paint_order is already back-to-front, so honouring it is a loop; expressing the same order through sixteen nodes' z-indices would hide the one thing that is still unresolved about it — the ties — behind Godot's own sibling rules, where a change in the export would silently become a change in Godot's tree order instead of a visible change in the draw sequence.

P1 draws rest and nothing else

Every element is drawn at its resting pose. No keyframe interpolation: that is P2, and it depends on the keyframe time unit, which is measured rather than decoded. A milestone whose gate is a pixel diff must not have a measured constant inside it, or the diff stops being evidence about the port.

For the same reason focused_id is empty at P1. Initial focus was measured as unstable boot to boot (HANDOFF Q5), so choosing one is an authored decision and it belongs to P5, where a human is pressing keys.

Nearest-neighbour, and why that is not a preference

TEXTURE_FILTER_NEAREST. The export is a 1:1 copy of the disc's own texels and elements draw at up to 500 %; a bilinear filter invents detail the disc does not have. It is also what the reference renderer does — ui_layout::blit maps destination to source by integer division — so a filter difference cannot masquerade as a placement difference in the diff.

The capture is the SubViewport, not the window

The screen is drawn into a SubViewport sized to the export's own design rectangle and shown through a container that scales it to the window. The first attempt captured get_viewport() and got 1235×695: there is a window manager on the Xvfb display and its title bar had eaten 45×25 px of a screen the export declares as 1280×720. A gate that compares a rescaled 1235×695 capture against a 1280×720 composite measures the compositor.

So --capture grabs the SubViewport texture: exactly the design rectangle, independent of the window, directly comparable with screen render with no crop and no resample. The windowed run is still worth doing — it is what proves a human sees the screen — but it is not what the numbers come from.

P1 gate — the diff, and what it found

tools/verify-screen renders every screen in the manifest both ways and reports the largest per-channel difference anywhere in the frame. Both renderers are held to the same inputs: the reference CLI built by build-reference-cli from the revision the exporter is pinned to (not /reborn/target/, which is a live mount that moves mid-iteration), --black because the screen carries its own background, and --primitives --animated because those are what make the CLI draw the same element set the port draws at rest.

screen	build	max per-channel Δ
main_menu	5	3	the P0/P1 gate screen
main_menu_jp	8	3
extras / extras_jp	6 / 9	4 / 3
press_start / press_start_jp	2 / 3	1
build_00 / build_01	0 / 1	3
build_10 / build_11	10 / 11	0	byte-identical
title	4	6	paint-order tie, below
title_jp	7	154	sampling phase, below

main_menu — the milestone's own gate — agrees to ≤3/255 on every channel of every pixel, RMSE 0.38 %, with no pixel differing by more than 4 %. 3/255 is what integer-truncating compositing in the CLI and float rounding on a GPU differ by; there is no structural disagreement anywhere in the frame.

Three screens exceed that, and each has a named cause rather than a threshold.

title: a tie in the paint order — neither renderer is wrong

Build 4 is the one screen where the CLI uses a paint order measured off the running game instead of deriving it. Compared against the order this port exports, every single disagreement is inside a tie — the two orders differ only among elements carrying identical layer keys (0x8083, the back2 glow group, and 0x80a0):

derived : … 15, 16, 17, 18, 0, 1, 2, 3, 4, 5, 7, …
measured: … 15, 18, 16, 17, 0, 2, 4, 7, 1, 3, 5, …

That is exactly the residual HANDOFF Q3 documents and this export already declares in unresolved: ["paint_order_ties"]. It is worth stating what it costs: 904 px in the glow band at (445,117)–(1195,313), all of them 4–6/255. The port keeps the stable sort, per HANDOFF's own recommendation. Nothing to fix, and nothing to tune — a "fix" here would be fitting the port to one screen's capture.

Two of the reordered indices (0x80a0) are kind & 0x4 template instances that both renderers skip, so the only real reorder outside the glow group is ptlogo2 against ptlogo_tm, which do not overlap.

title_jp: nearest-neighbour sampling phase — the CLI is the one I would call wrong

title_jp is the only screen in the export with a drawn element at a scale that is not a whole multiple of 100 %: ptlogo_eff2 at 125 %. It is also the only screen with a difference above 6/255. The two facts are the same fact.

At a non-integer ratio the two renderers pick different source texels:

• ui_layout::blit samples the source at the destination pixel's top-left corner — sxi = col * sw / dw.
• A GPU samples at the destination pixel's centre — floor((col+0.5)·sw/dw).

At 125 % those disagree on one column in five, which is why the differing pixels are ~30 above 100/255 strung along thin diagonal edges rather than a shifted region. At every whole multiple of 100 % they agree exactly, which is why the other eleven screens are clean.

Which is wrong: the CLI, I think. Corner-sampled nearest is a half- destination-pixel bias toward the top-left that no rasteriser produces, and the Xenon GPU that drew this screen sampled at pixel centres. But I have no framebuffer capture of title_jp and the disagreement is sub-pixel on one glow, so this is a reading, not a measurement — recorded in docs/BLOCKED.md rather than acted on. The port is not changing to match, because matching the CLI here would mean deliberately reproducing a half-pixel offset in order to make a number smaller.

extras: two pixels

Two pixels at 4/255. Rounding.

What the diff cannot tell us

The pivot question in docs/BLOCKED.md predicted that a P1 diff could not distinguish "anchor scale to the declared pivot" from "anchor to half the texture", because both renderers use the declared pivot. That prediction held: the port and the CLI agree on every scaled element, and that agreement is not evidence about which anchor the game uses. It stays open.

pteff05.t32 and pteff04.t32 have no sprite, and that is correct

RETRACTED 2026-08-29. This was wrong, and it was the most consequential thing on this page. See "The menu had no background" below.

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P2 — keyframe animation, 2026-08-28

The time unit is authored, in one file, and says loudly that it is not on the disc

authored/timing.json. HANDOFF Q1 is answered — linear ramp, 2 units per rendered frame, 1 unit = 1/60 s — but that conversion is measured off the running game, not read from a file, which is exactly the case the derived/authored split exists for. It is expressed as keyframe_units_per_second: 60 rather than seconds-per-unit so the value is exact instead of a repeating decimal, and it carries the two independent lines that support it. t stays raw everywhere in export/; seconds appear only where this file is applied, which is one line of boot.gd.

exit_ramp_seconds is deliberately null. See below.

The timeline stops at the last timed keyframe, and never plays the exit

The last keyframe of every group carries no t — the disc has no time slot there. Across this export that final frame is an exit pose: for 116 of 134 elements it differs from the last timed keyframe in alpha only (a fade-out), for 12 it is the loading splash's scale-and-slide exit, and for 6 it is identical (no exit animation at all).

So the group is pre-roll → ramp in → hold → [exit], and the port plays it up to the hold and stops. Playing into the exit would mean inventing how long the ramp takes, because the disc does not say. That duration is the screen transition — HANDOFF Q7 measured it at ~0.4 s — and it belongs to P3, with its own evidence. This is why exit_ramp_seconds is null rather than 0.4: P2 has no business holding it.

The interpolation is checked by where it lands, not by inspection

For 8 of the 12 screens the settled timeline is byte-identical to the --pose=rest render. That is the useful assertion: the port walks the keyframes with an authored time unit and arrives, to the pixel, at the pose the pinned decoders independently identify as the resting one. tools/screen-strip reports this per screen, so a change to the interpolation that drifts by one unit shows up as a diff rather than as nothing.

The four that differ do so for two distinct reasons, below.

rest misidentifies six elements, and the running game says so

On main_menu, the settled timeline and rest differ in exactly one region: 400×470 at (440,108) — the bounding box of ptframe1 and ptframe2, and nothing else on the screen.

rest puts both at their first keyframe: off-position and fully transparent. The keyframes say they slide (620,108)→(440,108) and (403,267)→ (583,267) while fading 0x00→0xff, and then hold that pose for their last three keyframes including the untimed one.

/reborn/docs/re/captures/main-menu-oracle.png, a capture of the running game, shows them: the bright circuit-frame bracket around the menu, with a ring at the bottom right. Cropping the same 250×180 region from the capture and from both renders puts the ring and its elbow trace in the port's timeline render pixel-aligned with the game's, and absent from the rest render. That is geometry, not luminance, so it does not depend on the capture's gamma or on the fact that it was taken with NEW GAME focused.

Why the decoders get it wrong, precisely

ui_layout::rest_plateau excludes a run of identical keyframes that ends the group, because that run is normally the exit — the comment cites the pause menu, where taking the trailing run erased the word PAUSE. That exclusion is right in general and wrong for an element with no exit animation, where the trailing run is the hold. The rule then falls back to an earlier run, which for a slide-in is the invisible pre-roll.

The condition that identifies the affected elements exactly, with no false positives in this export, is:

the final untimed keyframe has the same pose as the last timed keyframe

Six elements match it and rest misses all six: ptframe1/ptframe2 on main_menu and main_menu_jp, and pteff02 on title and title_jp. This is a finding for the RE agent about sylpheed-formats, not something this port fixes: the decoders are pinned and must not be reimplemented here. The port simply does not use rest — it derives the arrived pose from the keyframes, which needs no heuristic — and verify-screen still asks for --pose=rest so that renderer-vs-renderer diffing compares like with like.

Note what this says about P1: the port and the reference renderer agreed on main_menu to 3/255, and both were missing two elements the game draws. Two renderers reading the same field through the same decoder agreeing is not evidence that the field is right. docs/BLOCKED.md had already said that about the pivot; here it bit for real.

The title is not settled, and P2 does not claim it

title and title_jp differ between the two modes by much more (max 142 and 247), and there the disagreement is not the six-element bug alone. rest picks a mid-timeline hold for several glows (pteff01, ptlogoall_eff, ptlogoall_eff2, ptlogo_back2eff5) where the timeline runs on to a much brighter pose.

I could not settle which is right, and did not try to make the numbers agree:

• No element's alpha ever reverses direction anywhere in this export, so the title's 4.48 s timeline is a slow one-way ramp, not a pulse — which removes the obvious reason to expect a loop, but does not prove there is none.
• The only live title capture composites the PRESS Ⓐ plate (build 2) over the title (build 4), so it cannot be diffed against build 4 alone. Mean luminance is oracle 64.1, rest 62.8, timeline 80.0 — which looks like it favours rest, except that the plate adds brightness and rest is carrying a 25 % black dim quad (pteff02) that is itself one of the six misidentified elements. The comparison is confounded in both directions and settles nothing.
• Both modes are visibly wrong anyway. Side by side with the capture, the port draws a washed-out cyan glow slab across the logo that the running game does not have — in rest mode too. That is a third problem, independent of this one, and it is P3's.

So: the timeline is the default because it is derived from the disc's own keyframes with one measured constant and no heuristic, and because it is proven right on the screen this milestone gates. On the title it is unverified, and P3 should not assume P2 settled it.

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P2, corrected — the pin moved, and the settle rule was wrong, 2026-08-28

Answering the RE agent's question: which six, and on what screens

They asked, having found only two elements on the English main menu satisfying the condition this port proposed. The six span the whole 12-screen export:

element	screens	trailing run
ptframe1, ptframe2	main_menu, main_menu_jp	alpha 0xff — visible
pteff02	title, title_jp	alpha 0x00 — transparent

So four of the six are the pair they already found, once per language build, and their alpha rule accepts exactly those. The other two are pteff02, whose trailing run is transparent, so their rule excludes it and leaves rest at 0x40.

That exclusion is right, and their own measurement proves it. pteff02 is the 25 % dim quad; they measured the title render going from +13.14 to +0.55 against the plate-free capture once the dim is drawn. rest must therefore stay at 0x40 and must not move to the transparent trailing run — which is what their rule does. Two investigations converging from opposite directions.

The condition this port proposed was too loose; the alpha discriminator is the correct rule and the port has no amendment to offer.

The pin moved 8b6dbcf → 5414db3

Its own commit, and what I wanted from it is the fixed ui_layout::rest(). Pinned at 5414db3 rather than 4bc9706 where the fix was written, because 5414db3 is where it carries its disc-wide check — 30 of 13 991 elements move, 4 become visible, 0 become invisible.

The re-export is the evidence the change was contained: two files changed, and within them exactly four rest blocks — ptframe1/ptframe2 on both main menus moving from (620,108)/(403,267) at t=16 and alpha 0x00 to (440,108)/(583,267) at t=62 and alpha 0xff. Every diff line pairs; the other ten screens are byte-identical, pteff02 did not move, and no sprite changed.

The settle rule was wrong, and their title finding is what showed it

P2 shipped "hold the last timed keyframe", on the reasoning that the exit is the final untimed frame. That is wrong, and the title is the counter-example: pteff02 holds at t=46 with the dim at alpha 0x40 and then ramps to 0x00 by t=236. The exit is not only the untimed frame — it can be a long run of timed ones. Running to the end drops the dim and makes the whole screen ~13/255 too bright, which is exactly the luminance excess P2 recorded (oracle 64.1, rest 62.8, timeline 80.0) and could not explain.

A group is pre-roll → ramp in → hold → ramp out → post-roll, and a screen that has arrived sits on the hold. So the timeline now plays in and stops at rest, which is the decoders' identification of that hold and carries its own t. settle_units() is rest.t.

The check is that the disagreement vanishes: on all twelve screens the settled timeline is now byte-identical to the --pose=rest render, where before this change four of them differed by up to 247/255. The timeline's endpoint should be rest — the animation is what the timeline adds, not a different destination — so this is the property to want, and it now holds without a special case.

That also retires P2's open question about looping, from the other side: the RE agent measured that groups hold rather than loop (ptloop01/ptloop02 park off-screen at x=1521 and x=−839; 18 s of settled title sits at sd ≤ 0.01).

The reference renderer was stale for three diff runs

Worth recording as a process failure, because it defeated the project's whole verification method for a while and it failed silently.

After bumping the pin I rebuilt the reference CLI, and build-reference-cli reported success at rev 5414db3. verify-screen then showed main_menu jumping from 3/255 to 72/255. The natural reading — the port had regressed — was wrong. The port was right and the reference was a revision behind: the shared CARGO_TARGET_DIR still held a sylpheed-cli built from 8b6dbcf, and cargo reported Finished in 0.13s and left it in place. Building into a clean target directory produced a binary that resolves ptframe1 to (440,108) t=62; the shared one still said (620,108) t=16.

The old check — "does screen list run?" — cannot catch this, because a stale binary runs perfectly.

Two changes:

• build-reference-cli builds into $CARGO_TARGET_DIR/reference-cli/$rev, a tree keyed by the pinned revision, so a new pin has no artifacts to reuse. A stable copy is placed alongside for consumers.
• It then checks the binary against export/: both come from the same pin, so if the CLI resolves ptframe1's rest differently from what the exporter wrote, the two halves of the verification are not the same revision and it fails loudly. It compares the two rather than asserting a literal, so it stays true when the pin moves again.

docker/bin/ is baked into the image, so this takes effect on the next image build; until then the repo copy has to be invoked by path. The RE agent hit the same class of trap this session from the other side (./target/debug stale against a redirected CARGO_TARGET_DIR). It is worth naming the general shape: a build system reporting success is not evidence that the artifact you are about to trust is the code you pinned.

What this did not change

title (6/255), extras (4/255) and title_jp (154/255) are unchanged, and their diagnoses stand — a paint-order tie, two pixels, and nearest-neighbour sampling phase at 125 % scale. The title's swoosh defect the RE agent localised (drawn thick and white where the game draws it thin and pink) is untouched by any of this and remains P3's.

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The menu had no background, and P1 called that correct, 2026-08-29

The pin moved 5414db3 → f817dd5 for 56cc7ac, "a RATC child's name is stated, not inferred". ratc::parse had named each child by scanning backwards for the last printable run of bytes before its magic. For pteff05.t32 the three trailing payload bytes are 38 41 58 — 8AX — which beat the real name, so the child registered under a name no element declares and resolved to no sprite.

pteff05.t32 is the full-resolution background of all five menu screens.

So every render this port has produced of a menu screen has been missing its background, and P1 wrote that up as a property of the disc: "the bundle declares them and carries zero RATC children for either, so there is no texture on the disc to export." That sentence was false. The bundle carries the child; the decoder was handing back the wrong name for it. Retracted above rather than edited away.

What the re-export shows

Six new sprites and nothing else: pteff05.png on main_menu, extras and their Japanese twins, pteff04.png on both titles. Per screen the JSON gains a sprite line and layer_source moves "implied" → "sprite" — the layer key is now read from the file instead of taken from the decoders' table of keys measured off the running game. That is the derived/authored ratchet turning the right way, in the exporter rather than in authored/.

pteff05.png is 1280×720; ptbase.png, which had been carrying the background alone, is 640×360 drawn at 200 %. The screen was being shown its own art at half resolution.

Measured against the live capture, not against the other renderer

Whole-frame RMSE of the settled main_menu against captures/main-menu-oracle.png:

	RMSE
before this pin	8.05 %
with the real background	5.92 %

A 26 % reduction, and it is the right kind of evidence: the reference renderer was missing the same element for the same reason, so a renderer-vs-renderer diff could not have found this. It is the third time on this project that the capture caught something both renderers agreed on — the bracket, the title dim quad, and now the background.

verify-screen after the bump is unchanged in character: everything at 3–4/255 except title (6, the paint-order tie) and title_jp (155, the sampling phase). Both renderers gained the background together.

One thing the comparison says that I did not expect

Rendering with --focus=ptbtn01, which is how the capture was taken, makes the RMSE worse — 5.92 % → 7.00 %. The port replaces an element's sprite with its *f twin; sylpheed-cli's own --focus is documented as drawing the focused record over the base element. Those are different operations, and the capture shows a ring marker beside NEW GAME that the port does not draw.

This is P5's, not P2's, and it is not being guessed at here. Raised in docs/BLOCKED.md.

---

P3 — splash → title, unattended, 2026-08-29

The splash is located by entry index, because no rule can find it

The RE agent looked for a content predicate and there is none: design size fails (every extra composable bundle sampled is 1280×720, the same as every screen) and element count fails (fragments run 2…15 elements in GP_OPTIONS/GP_SAVE_LOAD while the splash halves are 3 and 7 — the ranges overlap).

So screen_builds is now is_build plus an authored allow-list of entry indices, in authored/screen_names.json under also_export, each with a why that says it is a locator and not a claim. This is safe in GP_TITLE and would not be in general: there, widening adds exactly four bundles and all four are real screens with zero fragments. That is why it is an allow-list rather than a loosened predicate.

There were two splash screens and the port had neither. Entries 11/14 are the developer logos (GAME ARTS / SETA / studio anima); entries 10/13 are the SQUARE ENIX publisher wordmark, the first thing the boot shows, and nothing in this project had noticed them. Both pairs are region twins — ™ on 10, ® on 13 — and the port shows one of each, not both.

authored/screen_names.json is now keyed by pak entry, not by ordinal

Widening the enumeration renumbers the ordinals, and a name that moves when the enumeration rule changes is not a name. The file had always called the entry "the stronger locator"; it is now the only stable one. In GP_TITLE the two coincide across all 16 entries, which is also the numbering sylpheed-cli screen --build N --all takes — so verify-screen now passes --all, and without it --build 10 would have landed on entry 12.

The two previously-unnamed plates therefore renamed build_10/build_11 → build_12/build_15. Their names were always locators; now they locate the right thing.

The exit is the group playing itself out, not a black rect over a freeze

HANDOFF's answer to ask 2 was (a), and it came with a test that discriminates rather than a plausibility argument. Under "a black quad over a frozen screen" every region is scaled by the same 1−α, so the button-region / background-region brightness ratio stays constant through the fade. Measured, it falls 6.495 → 5.574 → 3.105 → 2.125 → 1.935 — a 3.4× monotonic drop. The screen plays out: pteff00.prm ramps to opaque black while the labels, ptmsg, pteff10 and pteff12 ramp to transparent, and ptframe1/ptframe2 hold.

Implemented by giving the final untimed keyframe a synthetic time, exit_ramp_units after the last timed one, and then interpolating it like any other. One code path: the difference between arriving and leaving is only how far t is allowed to run, not a second kind of animation.

exit_ramp_units = 24 (~0.4 s) is authored, and authored/timing.json carries the RE agent's own reach caveat rather than smoothing it: the filmstrip is downsampled and the button region contains some background, so this pins the direction, not 0.4 s to ±0.05 s, and it is one transition pair.

Nothing waits on a timer the disc does not carry

dwell in authored/flow.json is deliberately empty. Each screen's dwell is its own keyframe group — the publisher wordmark reaches its hold at t=235 (3.92 s), the developer logos at t=190 (3.17 s), both read from the disc. Adding a hold on top would be inventing a number nobody measured. The pacing you see is the disc's own, and the file says where a measured number would go.

The last screen holds

A screen plays itself out because something is taking its place. Nothing takes the title's place yet, so the sequencer holds there. A boot that ends by fading to black is a boot that looks like it crashed. P4 puts the intro video in front of the title and P5 gives the title somewhere to go.

flow.json reproduces an observation and says so

Q6 closed with a negative: the order is in none of the four places it could have been, and a transition is a call with a name argument chosen by code. So this file is authored and its header says plainly that it reproduces what was watched, not what any file states. The intro video's place in the real boot is named as a gap rather than the order being quietly rewritten to hide it.

P3 gate

godot --path port -- --boot --film=/tmp/boot runs unattended:

publisher_logo  →  developer_logos at 4.65 s  →  title at 8.57 s
boot sequence complete after 13.05 s, holding on title

The filmstrip shows each screen fading in, holding, and fading through black into the next, and the title staying up. verify-screen covers all 16 screens now; the four new splash bundles come in at max 1–2/255 against the reference renderer. The three known differences are unchanged: title 6 (paint-order tie), main_menu 4, title_jp 155 (sampling phase at 125 % scale).

Answers taken from the RE agent without re-deriving them

• Focus stays "replace". Over-vs-instead is unobservable: the focused sprite covers the base at 100 % of base-visible pixels, and the two compositions differ by RMSE 1.1 inside the button rect — under the gamma floor. The port's guess was right for the wrong reason, and the actual gap is that ptbtn0Nf.rat declares two sprites — ptbtneff01.t32, a glowing ring, and then the bright label — where ptbtn0N.rat declares one. The ring is P5's, and its placement inside the record is not decoded, so it will be authored from the capture and marked as such.
• RMSE against captures has a floor, so stop chasing it. The capture is ≈ 255·(render/255)^γ with γ ≈ 1.49 on the menu and EXTRAS, 1.34 on the title, and it is a ramp the game installed (VdGetCurrentDisplayGamma at video init), not a capture-path artefact to subtract. Its reach is narrow — the flat patches it was fitted on are almost all dark — so the port will not extrapolate it across the range, and will not apply it to rendered output on this evidence. It is a comparison constant, not a rendering one.
• Rotation is escalated to a human and the port has not acted. The RE half is answered — rotate about the declared pivot, measured against the GPU capture — and it has zero effect on the five screens at rest. The port will carry rotation_deg in a future FORMAT v3 because carrying a decoded field the renderer ignores beats dropping it, but it will not draw it until the divergence question is settled.

---

P4 — the intro video, 2026-08-29

Theora at 720p is fine here, and no runtime dependency is requested

MISSION §6 anticipated that Theora might be too poor at 720p and permitted the FFmpeg-GDExtension fallback to be proposed. It is not needed, and this was measured rather than judged by eye alone. SSIM against the decoded source over a 10 s sample: 0.9863 at -q:v 6, 0.9896 at 8, 0.9924 at 10. At 200 % zoom on the reel's hardest case — fine serif text and soft gradients over near-black, where Theora breaks first — q8 is indistinguishable from the source.

-q:v 8, and no GDExtension is being proposed or adopted.

-ac 2 because the source is 6-channel WMA Pro and Godot's Theora path is not a surround one. That downmix is a decision, so it lives in the recorded command where a modder can see and change it rather than in prose.

The exact command is in the manifest, per MISSION §6

export/manifest.json gains a videos array, each entry carrying the verbatim ffmpeg line that produced it. A modder who dislikes the quality re-runs one line instead of reverse-engineering what was done to their video — which is the whole reason this project converts the disc rather than reading it at runtime.

A cache, and why that is not a hand-edit

export/ is regenerated wholesale, but re-encoding 232 s of video on every run costs ~4 minutes to produce a byte-identical file, and an exporter nobody re-runs is worse than a cache. So each movie gets a .cmd sidecar recording the command and the source size, and the encode is skipped only when both match exactly. Any change to either re-encodes. This is derived state validating derived state, not a hand-edit.

The player renders into the design viewport, not beside it

First attempt parented the VideoStreamPlayer to the Boot node. It played, and every captured frame was black: the capture reads the SubViewport, and the player was rendering to the window. Worth stating as more than a capture bug — everything this port draws composes in the export's own 1280×720 design space, and a movie outside that space is outside the coordinate system every screen is expressed in.

Ⓐ skips, because Q9 measured it

The only input the port handles so far. HANDOFF Q9: one Ⓐ press skips a movie, measured — the title was reached at 57 s against a 193 s baseline. Menu navigation is still P5.

P4 gate

godot --path port -- --boot --film=… runs publisher_logo → developer_logos → ADV.ogv → title, unattended. The filmstrip shows the SQUARE ENIX ident, then the reel's live-action-styled CG, then the title. The movie's place in the boot is measured, not decoded — Q9 decodes ADVERTISE_MOVIE → ADV.wmv from the movie manifest, but where it sits in the boot order is what the RE agent watched, and authored/flow.json says so.

What I cannot verify from here

Audible playback. This container has no audio device — Godot falls back to the dummy driver. What is verified is that the Vorbis stream exists in the transcode, is 2-channel, and decodes. Whether Godot emits it audibly is unconfirmed and is stated as unconfirmed rather than assumed from the stream's presence. It is a cheap check for anyone with a sound device and an impossible one here.

---

RETRACTION — sylpheed-cli is not the oracle, 2026-08-29

This corrects a framing that runs through everything above, so it is a retraction rather than an edit. Every place this file called sylpheed-cli screen render "the reference renderer" — and it does so repeatedly, starting at P1 — overstated what it is.

The correction comes from the human, via the RE agent, in their words: Reborn "was/is just a GUI explorer and extraction CLI for verifying the decoding of the various files. It may very well be wrong." The oracle is the Xenia Canary capture and the game.

So tools/verify-screen is a consistency check between two decoders that share their assumptions, and a regression detector. It is not a correctness check, and agreement in it is not evidence of correctness.

The embarrassing part is that this file already knew

After the ptframe1 case, P2's write-up says: "Two renderers reading one field through one decoder agreeing is not evidence that the field is right." Then P1's numbers kept being quoted as though 3/255 against sylpheed-cli meant the port was right. Having the principle written down did not stop me leaning on the agreement — which is worth recording, because that is the failure mode, not ignorance of the principle.

Three times both renderers agreed and both were wrong, all three caught by a capture and catchable by nothing else:

	what both got wrong	how it surfaced
pteff05	the menu screens had no background	the RE agent decoded the RATC child name
scale 0	drawn at full size instead of collapsed	RE agent's control run
rest()	ptframe1/ptframe2 invisible; the menu bracket missing	main-menu-oracle.png

What changes

• tools/verify-screen says all of this in its own header, calls the CLI the comparison renderer, and a DIFFERS row now means "we moved apart, find out which of us moved" rather than "the port is wrong".
• The correctness question moves to the captures. The RE agent has committed nine of them with an index at docs/re/captures/ORACLE-CAPTURES.md, covering all five screens in scope — including a main menu with OPTIONS focused, whose difference from the unfocused menu isolates exactly what focus changes.
• Three cautions travel with any capture comparison, and they are the RE agent's: the captures are not gamma-neutral (γ ≈ 1.49 menu, 1.34 title — there is a floor, do not chase it); geometry is sound (best alignment 0,0 at corr 0.9466, so a positional disagreement is real); and each is one moment of a still-animating screen, so compare settled poses or regions known to be at rest.

What does not change

The port keeps running verify-screen over all 16 screens every iteration. A consistency check is still worth having — it is total, it is cheap, and it is what catches a divergence the RE agent introduces on their side. It is simply not a grade, and this file will stop quoting it as one.

P5 groundwork — the focus record, checked against a capture, 2026-08-29

P5 is the lowest unfinished milestone (P0–P4 are gated above). This iteration did not implement navigation; it did the measurement P5 needs first, because the one thing P5 is built on — how a focused button is drawn — had three claims attached to it and none of them had been checked from this side.

The exporter already emits the focus record's second element

HANDOFF ask 3 answers with a 🔴: "what you are actually missing is the focus record's SECOND element" — ptbtneff01.t32, a 42×46 glowing ring, declared before the bright label in ptbtn0Nf.rat.

That gap is in the renderer, not the exporter. export/screens/title/main_menu.json already carries both, in declaration order, under focus.elements, for all five buttons — ptbtneff01 then ptbtn0Nf, each with its own pivot, rest pose and keyframes. Nothing needs to change in crates/sylpheed-export for the ring. What is missing is that screen_view.gd draws only one sprite per focused button. Recording this so P5 does not re-open the exporter looking for it.

The ring's size checks out exactly: ptbtneff01.png is 42×46, as stated.

The (7,7) focus offset survives a refutation attempt, uniquely

Ask 3 states the focused sprite covers the base at 100.0 % of base-visible pixels "once aligned properly (the true offset is (7,7), and at the centre alignment it reads a misleading 78–84 %)". P5 builds directly on this, so it was worth attacking.

Re-ran the RE agent's own metric on the exported PNGs — over every pixel where the base sprite is visible, the fraction where the focus sprite's alpha ≥ the base's — scanning the whole offset space, not just the stated answer:

alignment	ptbtn01	ptbtn02	ptbtn03	ptbtn04	ptbtn05
(7,7)	100.00 %	100.00 %	100.00 %	100.00 %	100.00 %
geometric centre	80.58 %	79.20 %	79.58 %	79.45 %	79.45 %
pivot-to-pivot	80.58 %	86.59 %	87.40 %	79.45 %	84.58 %

The refutation fails, and more strongly than the original claim. Over a 15×14 offset scan, (7,7) is a unique isolated cell at 100 % on every one of the five buttons — every neighbouring offset, including (6,6) and (7,6), falls below 90 %. The centre and pivot alignments reproduce the 78–84 % band the RE agent reported as misleading. A claim that survives a search of its whole parameter space is worth more than one checked at a single point, so this is recorded as strengthened, not merely unrefuted.

(7,7) is not a constant to apply — it is what the declared positions already say

An earlier version of this analysis had the port disagreeing with the capture by 6 px. That was my arithmetic error and it is worth writing down, because it is the mistake this format invites: I computed each element's top-left as pos - pivot, which gives base→focus deltas of (13,13) and a 29 % coverage — a confident wrong number.

pos is the top-left. screen_view.gd:121 is Rect2(pos - pivot*(s - 1), natural*s): the pivot is the anchor scale grows about and it cancels at 100 %, which is exactly the "can be got wrong invisibly" the comment there warns about. Getting it wrong invisibly is what happened.

With pos as the top-left, base − focus is (542,162) - (535,155) = (7,7) directly, on four of the five buttons. So P5 draws each focus element at its own declared pos and needs no offset constant at all. Nothing to author.

The one real find: ptbtn04 is 1 px off the grid on the disc

The focus records sit on a clean 80 px pitch — 155, 235, 315, 395, 475. The base records do not: 162, 242, 322, 401, 482, i.e. spacings 80, 80, 79, 81. So ptbtn04's declared base→focus delta is (7,6), while the art itself aligns at (7,7) — the coverage scan puts ptbtn04 at 100 % on (7,7) and below 90 % on (7,6), the same as every other button.

This is 1 px of authoring jitter on the disc, not a decode error, and it has one consequence worth stating: do not derive the focus placement from the base by a constant. Draw the focus record at its own declared pos. A port that "simplified" this to base + (7,7) would put ptbtn04's focus art 1 px off, and would look right on the other four.

Verified against a capture, not against our other renderer

Diffing two oracle frames isolates what focus changes without any instrument in the path: live-main-menu.png vs live-main-menu-options-focused.png differ in one tight cluster of 6 338 px at x 506..702, y 398..445. ptbtn04 is the OPTIONS button, and the union of its focus record under the pos-as-top-left reading — ring ptbtneff01 at (500,396) 42×46 plus label ptbtn04f at (535,395) 172×56 — is x 500..706, y 395..451. Those agree on all four edges to within a few px of near-transparent sprite border.

Under the pos - pivot reading the same record predicts x 433..604, y 367..422, which matches nothing in the capture — and no button matches that cluster. The capture, not our renderer, is what settles it.

An instrument that failed its own control, and was therefore discarded

To locate the buttons independently I wrote a masked normalised-cross-correlation template matcher and ran it as PROTOCOL requires — through a control first: match each base sprite against the plain capture, where the declared position is known and the answer must be a (0,0) delta.

It returned deltas of (13,5), (6,−19), (12,21), (−16,22), (6,8) at NCC 0.096–0.206 — noise, with three of five pinned to the ±22 search boundary. The control fails, so the instrument is dead rather than tuneable, and none of its output is used above. The button art is dark, low-contrast and further crushed by the capture's γ ≈ 1.49 ramp, which is the likely cause; a matcher for this corpus would have to work on gradients rather than luminance. Filed so the next iteration does not rebuild the same broken tool.

What P5 still needs, and has not got

• Initial focus is not stable across boots (Q5: 2× TUTORIAL, 2× NEW GAME). That is a value to author, with a why naming Q5 — it is not written yet.
• The ring's own animation is unread. ptbtneff01's two keyframes go rotation_deg 0 → 360 at t=120 with no second timed keyframe, i.e. a full turn. Whether it spins continuously while focused, or turns once and holds, is the group-loop question again — answered "groups hold" for build-in animations, but a 360° hold and a 0° hold are the same pose, so this group cannot be told apart by its rest pose. Not guessed; raised below.

---

P5 — navigation, 2026-08-29

The gate is "a human clicks through it", and the artifact is a walk that proves the wiring rather than the intent: up (which wraps 01→05), five down, Ⓐ into EXTRAS, down, Ⓑ back — landing on the main menu with focus restored to EXTRAS.

xvfb-run -a godot --path port -- --menu \
  --script=up,down,down,down,down,down,accept,down,cancel --shots=/tmp/p5

Ten PNGs, one per step, each taken after the screen it produced had settled. Contact sheet handed over as share id 1788002507-ef4468a0a33a.

The scripted walk goes through the input system, not around it

--script posts InputEventAction through Input.parse_input_event and lets it arrive at _unhandled_input exactly as a d-pad's press would. Calling MenuFlow.move()/accept()/cancel() directly would have been shorter and would have proved nothing: the thing most likely to be broken is the wiring between a press and the cursor, and a direct call is precisely the part that skips it. The same reasoning says the settle wait must be real — a shot taken before the screen stops moving photographs a fade and calls it a menu.

What is authored here, and what is derived

Split deliberately, because P5 is where the two are easiest to blur:

	where	why
the ORDER of the items	derived — each screen file's buttons, filled by the exporter from the button-role elements sorted by resting Y	it is on the disc
where an item goes	authored — authored/flow.json	HANDOFF Q4 measured the destinations; they are not in the file
which item opens focused	authored	Q5 measured that it is not stable boot to boot
what Ⓑ does	authored	Q5, measured — except on the main menu, see below
⬅➡ do nothing	authored, written as an explicit no-op	so that "the game ignores it" and "we never wired it" are different lines of code

Four of the five main-menu destinations are goto: null with a blocked note. That is not an unknown: DIFFICULTY, the save-slot list, the lesson list and the settings menu were all measured, and they live in archives this export does not carry. blocked and none are kept apart so a later reader does not "discover" a gap that was a milestone boundary.

EXTRAS is the only main-menu destination inside GP_TITLE, and therefore the only Ⓐ-into-a-submenu this gate can actually walk.

The one navigation rule with nothing behind it

Ⓑ on the main menu → title. HANDOFF Q5 states it, and flow.json marks it authored — likely but UNPROVEN, because the title also self-returns after ~8–10 s idle and a single unrecorded observation cannot separate the two. The port implements it anyway — a menu with no way out is worse than a menu with a plausible one — and says in the file that it did. Asked of the Decoder this iteration; see BLOCKED.md.

Independent corroboration that the main menu is different from its submenu: the main menu's footer advertises only Ⓐ : OK, while EXTRAS' footer advertises Ⓑ : Back. That is on the disc, in ptmsg.png vs ptmsg2.png, and it is visible in both the port's render and the captures.

A press during a fade is dropped

Authored, and not measured. Nobody has watched what the game does with a button pressed mid-transition. Dropping invents less than queueing does: it cannot manufacture a press the game might have discarded. flow.json says so under navigation.input_during_transition.

---

--headless cannot draw, and the port hung instead of saying so, 2026-08-29

docs/port/PORT-MISSION.md and the loop prompt both name godot-headless as how this project runs unattended. It does not work, and the way it failed was the worst available shape.

Measured, not assumed. Under --headless Godot's dummy renderer never emits RenderingServer.frame_post_draw. Every capture path in boot.gd awaits it — --capture since P1, --film since P3, --shots as of this milestone — so all three blocked forever. Isolated by the difference between two runs:

godot --headless --path port --quit                                  # prints, exits 0
godot --headless --path port -- --screen=… --capture=…               # no output at all, killed at 40 s

The second produces zero bytes of output before it is killed, because Godot's stdout is block-buffered and never flushes. So the observable behaviour of an unattended headless capture was: silence, forever. In a loop, a job that waits reads as a job still working — this is the failure mode that costs a whole iteration and leaves nothing behind to say what happened.

Two changes, and deliberately not one:

• --capture, --film and --shots refuse at startup under --headless, naming the flag and printing the xvfb-run line that does work. Refusing early rather than at the first frame means the run does not die halfway through a filmstrip with some frames written.
• --script no longer waits for a drawn frame when it is not going to photograph one. Navigation is checkable where nothing draws, and that is worth keeping: godot --headless --path port -- --menu --script=… now walks the menus and exits 0 in about four seconds, which is a cheap regression check that needs no X server at all.

The Xvfb path is unchanged and is what produced the P5 artifact.

---

Refutation — the focus ring IS drawn rotated, and it is not at 0° in either capture

Attempted against the Decoder's 7eeae30 ("re(ui): the focus ring SPINS, the game draws it, and the leaf owns the f record"), point 2: that in the OPTIONS-focused capture the ring's bright head sits in a different angular position from the sprite's own, caught mid-spin. It survives, and the evidence is stronger than what was claimed.

Chosen for refutation because it is exactly what PROTOCOL says to aim at: a claim the port is about to build on, resting on an estimator (a brightest-region centroid) whose own control the Decoder reported as ±19.8°.

The test, and why it needs no absolute registration

live-main-menu.png has ptbtn01 focused; live-main-menu-options-focused.png has ptbtn04 focused. Both draw the same sprite, ptbtneff01.png — the export confirms the two focus records name the same file. So the two captures contain two instances of one 42×46 image, 240 px apart in design space, and the question "is it drawn rotated" becomes "are these two crops the same image at a different angle" — which needs no crop offset and no reference to our own renderer.

Method: sample each ring into a 360-bin angular luminance profile over the annulus band (r = 9…15 px, bilinear, 0.5 px radial step) and circularly cross-correlate. A rotation about the centre shifts that vector and changes nothing else.

The instrument was run through two controls before it was believed

control	result
rotate a capture's own ring by a known 0/30/90/150/210/270/330° and recover it	0° error on all seven, peak corr 1.000
the same estimator on a ring-free 60×64 patch of the same capture	peak corr 0.369 — it does not manufacture a match

The measurement

On one shared centre for all three images, so a centroid difference cannot masquerade as a rotation:

pair	best shift	peak corr	corr at 0°
capture A vs capture B	134°	0.968	−0.064
sprite (unrotated) vs capture A	76°	0.969	−0.295
sprite (unrotated) vs capture B	210°	0.948	−0.181

210 − 76 = 134: the three measurements are internally consistent, which nothing in the method forced them to be. Sweeping the centre by ±2 px moves the A-vs-B answer over 117…161° while the peak correlation stays 0.9+ across the middle of that range, so the magnitude is ~134° ± ~15° and the precision claim stops there.

Evidence sheet — sprite, capture A, capture B, each cropped at the declared 42×46+500+156 / +500+396 — handed over as share id 1788002507-afe1ad843789. The phase difference is obvious by eye; the numbers are here so it is not only obvious by eye.

The two things this settles for the port

1. The game draws rotation_deg on an element the English boot path shows. This is a second, independent confirmation on a different screen and a different element from the ptloop sweeps, and it moves HANDOFF ask 4 (should the port draw rotation) off "changes nothing at rest" — it changes the main menu's focus marker, in every frame.

2. 0° is not a pose the running game shows. screen_view.gd currently draws the ring at its rest pose, which is rotation_deg 0, and both captures put it at 76° and 210°. So the port's focus marker is known to be wrong, not suspected — and the comment in screen_view.gd now says which two numbers it is wrong against.

Registration, as a by-product

The ring's annulus centroid lands at (32.94, 36.63) and (33.30, 38.90) in windows whose design-space prediction under a zero crop offset is (33.0, 37.0). Within ~0.4 px on the better-thresholded of the two. That corroborates ORACLE-CAPTURES.md's "1279×675, top-left aligned" directly, on a feature nobody chose for the purpose.

⚠️ Do not read the earlier P5-groundwork note "button text bands land at design y + 23" as a crop offset — it is an offset within the button sprite, and the two were nearly confused here.

What the port did NOT do about it

It did not start spinning the ring. The period is a guess with two unknowns and both belong to the Decoder:

• the keyframes are t=120, rot 0 then an untimed rot 360. Under HANDOFF Q1's replicated reading ("+36 is the time the NEXT pose is reached") that is one revolution in 120 units = 2.0 s — but this port's pose_at implements the other reading, and switching it is a change to every screen's animation timing, not a P5 change;
• "groups hold" (settled 2026-08-28) predicts the ring stops at 360° = 0°. Both captures show it elsewhere. That is either a spin that loops, or two captures both taken inside the first two seconds of focus. The port cannot tell those apart, and a wrong answer here is a visible continuous rotation on whichever button the player is sitting on.

Filed in BLOCKED.md and asked over the message channel. What settles it is two frames of one focused button a known time apart.

---

P5 end to end — and the title does not say PRESS Ⓐ, 2026-08-29

The gate walk above starts on a screen. This is the whole thing, unattended, in one run — the sequence PORT-MISSION names as the objective:

xvfb-run -a godot --path port -- --boot --play \
  --script=accept,down,down,down,down,accept,cancel,cancel --shots=/tmp/e2e

screen publisher_logo …           settles at t=235 (3.917 s)
  -> developer_logos at 4.70 s
  -> video ADV at 8.60 s
     video ended at 151.91 s
  -> title at 151.91 s
boot sequence complete after 156.30 s, holding on title
  menu on title
script[1] accept   (A) -> main_menu
…
script[6] accept   (EXTRAS) -> extras
script[7] cancel   (B) -> main_menu   focus restored to ptbtn05
script[8] cancel   (B) -> title
script complete after 166.76 s on title

Publisher wordmark → developer logos → ADV → title → Ⓐ → main menu → navigate → Ⓐ → EXTRAS → Ⓑ (focus restored) → Ⓑ → title. Contact sheet shared.

Two smaller things this run found, both fixed here:

• the boot step's why in authored/flow.json still said "nothing takes the title's place until P5 gives it somewhere to go". P5 has. Rewritten to say what is actually true — --boot still stops on the title, and --play hands the held title over; the stop is not a bug and the handover is not another boot step.
• an empty focus printed as a line that trailed off, which reads like a value went missing rather than like there is none. The title is a screen with no buttons that still takes Ⓐ, so it prints (none -- this screen has no focusable item).

Also confirmed on the way: entering a submenu directly (--menu=extras) and pressing Ⓑ enters the parent at its authored initial focus, not at a restored one — there is no history to restore, and MenuFlow.cancel only claims a restored focus when the stack agrees about where it is going.

🔴 The port's title does not tell the player to press Ⓐ

Found by running the objective end to end, which is the only thing that would have found it: the boot's last step is title (build 4), and build 4 has no PRESS Ⓐ BUTTON plate. P5 has now made Ⓐ the only way off that screen.

This is not a guess about the art. Both states are captured off the running game and they differ by exactly that plate:

	capture
title without the plate	title-builds/live-title-build4-no-plate.png
title with the plate	title-builds/live-title-press-a.png

And the plate is already exported — press_start, GP_TITLE build 2 (HANDOFF Q2), sitting in export/screens/title/ unused by anything.

This is P3's gate, not P5's, and P5 is what exposed it. Recording rather than fixing, for two reasons:

1. Which state an idle post-boot title shows — build 4 alone, build 4 with the plate over it, or build 4 then the plate after a delay — is behavioural, and the port has no oracle for a sequence. The game demonstrably has both states; nothing here says which one follows the intro movie. That is the Decoder's.
2. Showing it would mean drawing two builds at once, which this port has never done — every mode loads exactly one screen. That is a real change to ScreenView, not a line in flow.json, and it should not be smuggled in under a navigation milestone on the strength of "it looks more right".

Filed in BLOCKED.md. Not blocking: P5's gate is Ⓐ into a submenu and Ⓑ back, and both work.

P6 — menu audio, 2026-08-29

The disc's menu sound reaches Godot as Ogg Vorbis: three cues and one music bed. Nothing in port/ has heard of XMA, sound.pak or Static.slb, and nothing in it reassembles anything — sylpheed_formats::media does that and the exporter converts what it hands back.

The cue offsets moved OUT of the exporter, into authored/

The previous iteration left crates/sylpheed-export/src/audio.rs holding the three Static.slb offsets as a Rust const CUES. That is wrong under MISSION §3 and the fix is the first thing this iteration did.

Those offsets are measured, not decoded. Static.slb has no RIFF, no seek chunk and no container: it is a packed run of whole 2048-byte XMA1 packets, and a wave is defined only by (offset, packet_count). Both numbers came from the running game — Canary with --xma_param_probe=true prints a stream's packet count and first 32 bytes when it is played, and searching those bytes in the bank gives the offset (HANDOFF Q8).

A measured value compiled into the exporter is a measurement wearing the costume of a decoded field. It reads as though the exporter derived it from the disc; nobody deletes it when the real answer lands, because nobody can see that there is anything to delete. So the table is authored/audio.json se.*, each row carrying its own why, and the exporter holds no cue table at all.

crate::video::MOVIES stays a const in the exporter, and the contrast is the point: Q9 decoded that mapping off the movie manifest on the disc. Same shape, different provenance, different home.

name_match is a field, and its absence means something

Q8 names SE_UI_CURSOR for the move cue by name match against the authors' own identifiers — a plausible guess, not the measurement. For Ⓐ, Q8 is explicit that the wave was not separated between SE_UI_DECIDE and SE_UI_SUB_WIN_OPN, so no name is claimed at all.

name_match therefore travels beside every cue in authored/audio.json and in manifest.json, and an absent one means nobody claimed a name — never that the binding is unknown. The binding is the measured part. Collapsing the two would turn "we did not separate two candidates" into "we do not know what this sound is", which is a different and much weaker statement than the one the RE agent actually made.

The BGM is NOT a choice, and this port spent an iteration believing it was

The first draft of authored/audio.json picked BGM_001, wrote a careful why explaining that the choice was arbitrary, and was wrong.

docs/port/BLOCKED.md carried the row that caused it: "not on the disc … the port is choosing a track, and that choice is authored." The menu's music is BGM_103, and it is in HANDOFF at 9ca1eb5 — the exact commit that page says it was reconciled against. So this was not staleness. The row was wrong when it was written.

What HANDOFF says is a negative with a bound, and the bound is the entire content of it:

the tables cannot say — SOUNDS, FILES and the bank headers name no screen. GamePart_Title's phase handler sub_821C5580 carries li r5, 1103 into a sound call; cue 1103 is BGM_103; and BGM_103.slb's two declared waves (3 876 864 / 3 930 112 B) are byte-for-byte the two streams the XMA probe saw decoding at the main menu. Static code, disc census and runtime all agree. "The port does not have to choose a track."

The failure is worth naming precisely, because "read HANDOFF more carefully" is not the lesson — BLOCKED.md's own staleness check passed, twice, and would pass again. A negative summarised without its reach reads as a bigger negative than it is. "The tables cannot say" became "it is not on the disc", and one word of scope was the whole answer. A row in BLOCKED.md must quote the reach.

It also cost a second thing worth recording: the port would have shipped a menu playing the wrong music with a confident why beside it saying the choice was deliberate. That is exactly the shape of error this project's vocabulary exists to prevent, produced by the machinery meant to prevent it.

The bank name carries .slb, and that is how the mistake surfaced

BGM_001 is not in sound.pak. BGM_001.slb is — media::read_sound_bank looks up name_hash(name) against the TOC, and the TOC hashes the file name. Static.slb worked from the first run only because the RE finding happens to write it with its extension.

So the wrong track never played: the export failed loudly with "BGM_001: not present in sound.pak". That is luck, not design — had the draft picked a name that happened to resolve, nothing would have complained. The why in authored/audio.json now records both the correct name and why the short form fails.

export_bgm now distinguishes the two cases it was conflating. A bank that is not in this disc's sound.pak is a missing asset: the manifest takes a warning and everything else still exports. Any other failure — a short read, a malformed bank — still stops the run, because a partly-read bank produces a file that plays.

The two stems are summed. That part is not a choice

Q10 also measured that a bank's sub-waves are two stems of one performance, played together — sample-synchronous, equal duration, on all 32 banks. Concatenating them is explicitly wrong.

Emitting them as two files would be wrong for a second, independent reason: MODDING rule 1 is one logical asset, one file, and handing a modder two stems to line up by hand is precisely the reassembly the exporter exists to have already done. amix=normalize=0 sums at unity rather than halving, because halving is a mix decision nobody made — and because a sum can clip, the peak is measured and reported rather than silently corrected.

The loop seam is ugly on purpose

No loop-point field has been identified. loop: "restart" replays from sample 0, so a listener hears the track's own fade-out and its trailing silence before the music comes back.

Trimming to the fade would sound better and would be worse. It would invent a loop point, and an invented one is indistinguishable from a decoded one a month later — which is the failure mode this whole project is organised against. The seam stays audible until a loop point is measured or a capture of the real menu looping settles it.

When a cue fires — two rules measured, one authored

• Move fires on a press that actually moves the cursor. MenuFlow.move() already returned whether it did, which is why left/right stay silent by construction rather than by a rule written twice (Q5: ⬅➡ do nothing, and Q8: they play nothing).
• Ⓐ and Ⓑ fire when the press does something, and not when nothing is bound. 🟡 This half is authored and NOT measured — nobody has watched the game take a dead press. Silence invents less: a sound the game does not make is a wrong fact you can hear, while a missing one is a gap. blocked counts as doing something, because those destinations were measured off the running game and are missing from this export, not from the game.
• The bed starts when the menu becomes live and carries across submenus. play_bed is idempotent, because music that restarts every time you press Ⓑ is the kind of wrong that reads as "the audio works".

--audio= records the Master bus, because neither container has a sound card

docs/port/AUDIO-VERIFICATION.md §2. An AudioEffectRecord on the Master bus captures the mixed output from inside a headless run with no device at all, and that is the only thing that closes the loop the file opens: comparing an exported Ogg against the disc proves the asset is right and says nothing about whether the engine ever reached it.

The run prints AudioServer.get_driver_name() beside the file it wrote, because "recorded under a dummy driver" is a weaker claim than "heard" and the write-up has to be able to say which one it is making.

The WAV is saved in _exit_tree rather than beside each quit(). There are eight of those, and the one that would get missed is an error path — exactly the run whose audio somebody wants to look at.

check now refuses silence and clipping

sylpheed-export check gained an audio pass, and two of its rules are content checks rather than schema checks. That is deliberate. Silence is the audio failure that looks like success — a file of the right duration, the right channel count and the right size, full of zeroes — and it passes every structural check there is. Clipping is the other one, and the BGM can produce it because it is a sum at unity gain. The exporter measures both at export time; check refuses a tree whose peak is ≤ −90 dBFS or ≥ 0 dBFS.

Neither is a judgement about whether the audio is the right audio. Nothing in that binary can know that, and BLOCKED.md says which parts are still authored guesses.

A bug worth naming: the temp name ate the file extension

run_ffmpeg wrote to .back.ogg.partial — the temp-name-then-rename discipline this project uses everywhere, and which AUDIO-VERIFICATION.md records as already having caused a confident wrong number once.

ffmpeg picks its muxer from the output filename, so that is not a slightly uglier temp name; it is a hard failure before a byte is written: "Unable to choose an output format for '.back.ogg.partial'". video.rs already had the right shape (.ADV.partial.ogv) and this function was written from scratch without looking at it. The extension goes last.

Refutation — the three Q8 cue durations, checked end to end

The claim: HANDOFF Q8 publishes three cue lengths — move 0.533 s (8 192 B, 4 packets), back 0.344 s (4 096 B, 2), confirm 1.016 s (12 288 B, 6). P6 is built directly on top of these, which by PROTOCOL's own rule makes them the right thing to attack: refutation is cheapest where the other agent is most confident, and most valuable where the port is about to build.

Why they looked attackable. The three do not share a rate. Seconds per packet is 0.133, 0.172 and 0.169 — the move cue is 22 % off the other two. If a packet were a fixed span of audio, at most one of these numbers could be right.

Why that is not a refutation. An XMA1 packet is 2 048 bytes of bitstream, not a fixed span: it carries a variable number of 512-sample frames. At 48 kHz a frame is 10.667 ms, and the three durations come to 50.0, 32.3 and 95.3 frames — near-integers, which is what a variable-frames-per-packet encoding looks like and is not what an arithmetic slip looks like.

The measurement. The exporter reads (offset, packet_count) through media::se_wave_riff, decodes, and ffprobes the finished Ogg:

cue	Q8 claims	exported file measures
move	0.533 s	0.533 s
back	0.344 s	0.344 s
confirm	1.016 s	1.016 s

Verdict: survives, exactly, at every published digit. Recorded as a survival rather than a pass, because that is what PROTOCOL asks for — a claim that has survived an attempt is stronger than one nobody challenged, and the corpus should say which it is.

⚠️ Reach, stated so nobody over-reads it. This is not independent of Q8: the durations were derived from the same packet counts the exporter feeds in, so what it confirms is that reading those (offset, packets) through sylpheed_formats::media yields streams of exactly the claimed length — i.e. that the transcription into authored/audio.json and the assembly path are right. It does not confirm that these three waves are the sounds the game plays on those three events; that is Q8's own measurement, taken by playing them, and this port has no oracle to re-take it with.

The attempt did find something, just not here: see the BGM section above, where the port's own BLOCKED.md row failed the same kind of check.

The BGM bank has three sub-waves and HANDOFF says it has two

media::sound_bank_riffs("BGM_103.slb") returns three. HANDOFF Q10's census says a music bank is "exactly two waves of identical duration (32/32 banks on the disc)" — and that census is itself a correction, of an earlier reading that called BGM_001 three sub-waves and was refuted with "the 10 KB is the bank header".

The third comes from sylpheed-formats/src/slb.rs:380, to_xma_riffs: when a bank has a leading headerless packet region ahead of its first RIFF, that region is emitted as a sub-wave. It exists because the voice path needs it — VOICE_D_453 decoded to 0.14 s without it. docs/re/REFUTED.md already records the same region as what makes BGM_106–BGM_109 "break the two-wave rule".

The port sums all three and says so in the manifest. That is not the appealing answer — dropping sub-wave 0 would give a file matching the census, and it would have been one line. It is the correct one: which bytes belong together is the question sylpheed_formats::media owns, MISSION §2 names re-deriving it here as the single easiest thing in this project to get subtly wrong, and "the decoder returned something the corpus does not predict" is a finding to report, not a number to quietly adjust. Adjusting it would also have destroyed the evidence: a corrected export looks exactly like a correct one.

So the export ships the decoders' answer, the manifest carries a warning naming the contradiction, BLOCKED.md has the row, and the Decoder has the pointer. Until it comes back, the menu plays a sum of three things where the census predicts two, and every one of those places says so.

Clipping — and a comment of mine that argued for the thing that clipped

The BGM came out at +1.8 dBFS. The comment above the code that produced it said amix=normalize=0 sums at unity "because halving is a mix decision nobody made".

That was wrong in both halves. Unity summing is a decision, and it is the one that clips. And 1/n is not a taste call: it is the smallest constant that makes an n-input sum of unity-scale signals provably clip-free, which is precisely the reasoning video.rs already carried for its 0.4142-normalised 5.1 downmix — in this same repository, written by this same port, and not looked at. It preserves the stems' relative balance exactly, which is the only thing about the sum that Q10 settles.

It is written as an explicit volume= rather than left to amix's normalize=1 default, so the coefficient appears in the manifest's command line. A default is a decision nobody made and it can move under an ffmpeg upgrade — the same argument MISSION §6 makes about the downmix matrix.

The confirm cue is a different case and is not "fixed". It lands at +0.18 dBFS, and it is a single wave off the disc with no arithmetic of ours in it: the disc masters it near full scale and a lossy decode of a near-full-scale signal overshoots by a fraction of a dB. Attenuating it would mean altering a game asset to make one of our own numbers smaller. So check bounds the two kinds differently — a bgm peak ≥ 0 dBFS is refused outright, because it is our sum; an se is refused only above +1.0 dBFS.

🟡 That +1.0 is a judgement and not a measurement, and it is the weakest number in P6. Nobody has measured the overshoot distribution across a corpus of cues. If a cue ever trips it, the right response is that measurement, not a looser bound.

P6 gate — the audio is in the mix, and a null control says which part

No container here has a sound card, so "P6 works" cannot be answered by listening. docs/port/AUDIO-VERIFICATION.md splits the question into three, and these are the two that need no device.

1. The exported files, measured off the finished assets

se    back      -> audio/se/back.ogg    (0.344 s, peak  -5.7 dBFS)
se    confirm   -> audio/se/confirm.ogg (1.016 s, peak  +0.2 dBFS)
se    move      -> audio/se/move.ogg    (0.533 s, peak  -1.4 dBFS)
bgm   main_menu -> audio/bgm/main_menu.ogg
                  (87.744 s, peak -7.7 dBFS, bank BGM_103.slb, 3 sub-waves)

sylpheed-export check export passes: 16 screens validate, and every audio entry carries a peak and a duration inside its bounds. The three cue durations match HANDOFF Q8 at every published digit — see the refutation record above.

2. The engine, recorded off the Master bus

godot --path port -- --menu --script=down,down,accept,cancel --audio=…/p6.wav
  → recorded 6.037 s of Master bus (driver Dummy)
    peak 0.0 dBFS, RMS −21.1 dBFS

Non-silent is not the claim. A WAV of the right duration full of the bed would look exactly like this, and the cues could be missing entirely. So the cue was isolated with a null control: the same scripted walk with ⬅ in place of ⬇. Left/right are measured no-ops (Q5) and fire nothing, so the two runs differ by exactly two move cues and nothing else — same screens, same transitions, the same Ⓐ and Ⓑ cues in both, the same bed.

	RMS
walk with two ⬇ presses	−21.9 dBFS
walk with two ⬅ presses (null)	−22.1 dBFS
difference	−34.6 dBFS

The difference is not spread over the run. It is one burst beginning at t = 1.10 s and lasting 0.55 s — two overlapping 0.533 s move cues — with 22 of 237 windows above −70 dBFS and silence everywhere else, including across the Ⓐ and Ⓑ presses, which cancel because both runs make them. That is the cue reaching the bus, separated from the music that was playing over it.

The control that proved nothing, kept because it nearly passed

The first attempt paired --script=down,down against --script=left,left. The difference was bit-identical zero, which reads as "the cues never reached the bus" and would have been reported as a bug.

It was neither. Both runs recorded 1.115 s while the first press lands at ~1.17 s: the control ended before the event it was controlling for. A null result from an instrument that was not running is not a null result — PROTOCOL's "run your own instrument through a control" applies to the control too.

What this does NOT establish

• That it sounds right. Everything above is correspondence and separation, not judgement. A ten-second human listen still answers something no measurement here does.
• That the bed is at a sane level against the cues. 🔴 The Master bus peaks at 0.0 dBFS in the four-step run — the confirm cue is +0.2 dBFS on its own, so any music under it puts the mix on the ceiling. Per-file levels are the disc's and are fine; the runtime mix has no headroom. The port has not set a bus balance, because nothing measures one and an invented balance is the same class of mistake as an invented loop point. Recorded here rather than fixed quietly.
• That "Dummy driver" means heard. It does not, and the run prints the driver name so a write-up cannot forget to say so.

One bug, in two dialects, both about a temp filename

The temp-name-then-rename discipline this project uses everywhere broke twice in this milestone, in two different tools, for the same underlying reason: tools dispatch on the extension, so a temp name must preserve it.

• run_ffmpeg wrote .back.ogg.partial → "Unable to choose an output format", a hard failure before a byte was written.
• boot.gd wrote p6.wav.part → save_to_wav appends .wav when the path does not end in it, producing p6.wav.part.wav; the rename then failed to find its source, its return value was not checked, and the run printed a success line naming a file that did not exist.

The second is the more dangerous shape, and it is the one this project has already warned itself about: a confident line of output pointing at nothing. The rename's return is now checked and the failure is loud.

P3, reopened — the boot title was missing the PRESS Ⓐ plate, 2026-08-29

P3 passed its gate with a boot that ended on build 4 alone. BLOCKED.md carried that as 🔴 from the start: both states were captured, so the art was never the question — the sequence was, and it is behavioural, so the port had no oracle for it.

It is answered. docs/re/title-plate-delay-measured.md (auto/no-disc-and-menu-captures at fb536df, not on main at the time of writing) measures two independent boots: the title presents without the plate, and the plate arrives 2.13 s later, the two runs agreeing to 6 ms.

Two builds at once, as two ScreenViews

ScreenView draws one screen. The obvious change was to teach it about a subordinate overlay screen; the change made was to put a second ScreenView in the same SubViewport, after the first.

That is what "two builds at once" actually is. Each build has its own timeline, its own textures and its own hold — the plate's group runs independently of the title's, which is the entire content of the finding — and Node2D siblings already paint in tree order. The alternative would have put an if overlay in every method that walks elements, and would have expressed the same information less directly. The export's paint_order still means what it always meant: an ordering within a build.

The delay is timed from where build 4 stops animating

Not from where the title first appears. This is the finding rather than a detail: measured from first-draw the two oracle runs differ by 0.48 s, because the build-in itself ran 1.64 s and 2.13 s and the emulator's frame pacing during an animation is not the game's clock. Measured from settle they differ by 6 ms.

So _boot_done — the moment the sequencer already had for "this screen has reached its hold" — is the landmark, and the overlay is due after_settle_seconds later. A number taken from the wrong instant here looks exactly like a measurement.

The overlay is attached to the BOOT STEP, not to the title screen

What was measured is the boot title. Whether the plate is there when the title is reached again — by Ⓑ from the main menu, or after the attract movie — is not measured, and hanging the overlay on the screen would quietly claim that it is. So it lives on the boot step in authored/flow.json, and _drop_overlay takes it away with the screen it belongs to. BLOCKED.md carries the gap.

Refutation — the RE agent's instruction contradicts the RE agent's measurement

The claim under test, quoted from the finding's "What the port should author": draw build 4, "when build 4 has settled, wait 2.13 s, composite build 2 over it".

It does not reproduce the measurement it came from, and the gap is 3.97 s. Build 2 is not a static plate: it has a group, and this port plays groups. press_start has one element, ptbtn00, and its fade_argb reads

t=214  0x00ffffff   pos (383, 560)      invisible
t=236  0x00ffffff   pos (383, 550)      still invisible, having slid 10 px up
t=238  0xffffffff                       full alpha
t=244  0xffffffff                       holds
  —    0x00ffffff                       the exit, untimed

At the measured 60 units/s that is 3.967 s from the group's start to full alpha. Compose the instruction with the group and the plate is first visible at settle + 2.13 + 3.97 = settle + 6.10 s. What was measured — the glyph counter leaving its no-plate value of 154 — is the plate becoming visible at settle + 2.13 s.

Neither obvious reconciliation works:

reading	plate visible at	measured
both groups start together	3.97 s (build 4 settles at 4.350 s) — i.e. 0.38 s before settle	settle + 2.13 s
build 2's group starts at settle	settle + 3.97 s	settle + 2.13 s
build 2's group starts at settle + 2.13 s (the instruction)	settle + 6.10 s	settle + 2.13 s

To land on the measurement, build 2's group has to start 2.51 s after build 4's, which is not a landmark of anything.

Verdict: the instruction is refuted as written; the measurement is untouched. The measurement is an observation of the running game and this port has no standing to doubt it. What is refuted is the step that turns it into an authoring rule, and that step is an interpretation.

So the port ships the instruction, not its own arithmetic, prints the discrepancy on every boot, and files the row. This is the same call as the BGM sub-waves and for the same reason: reconciling two of the RE agent's numbers is a decoding question, and a port that quietly picks the one that looks right destroys the evidence — a corrected boot looks exactly like a correct one.

The first thing to check is about the instrument rather than the game: is "title settled", the glyph counter first reading 154, the same instant as the port's last-element settle (t=261, 4.350 s into the group)? If that landmark is earlier, the gap closes with nothing else moving.

Refuting the port's own claim: things in this export DO pulse

BLOCKED.md has carried this since P2, under the port's own raised question about whether groups loop:

no element's alpha reverses direction anywhere in this export, so nothing pulses, which removes the obvious reason to expect a loop without disproving one.

ptbtn00 reverses. 0x00 → 0xff → 0x00, in the table above, in the export, the whole time. The claim was never checked against press_start; it was checked against the screens P2 happened to be animating. The RE agent has now measured the running game pulsing this exact element at a mean 2.24 s.

So the reason to expect a loop is back — and the port still does not draw one, because no reading of this group produces 2.24 s: the whole group is 268 units = 4.47 s, and from its first keyframe 54 units = 0.90 s. The plate is drawn arriving and then holding at its settle (t=238, alpha 0xff), which is what every other screen does and what the static oracle capture live-title-press-a.png shows. Which instant a repeat restarts from is filed, not guessed.

--boot --capture= — one frame instead of six hundred

The boot had no artifact of its own except --film, a PNG every 0.25 s for the whole 156 s run, to answer one question: is the plate on top of the title at the end. --capture was a --screen-only flag taken in _ready, which for a boot run is 150 s too early. It is now deferred to the end of the sequence when --boot is given.

P3 gate — the boot ends on two builds

godot --path port -- --boot --capture=…/p3-plate.png
  → boot sequence complete after 155.86 s, holding on title
    overlay press_start due at 157.99 s (+2.13 s after settle)
    overlay press_start raised at 158.00 s, 1 element(s), settles at t=238
    ⚠ plate raised at settle+2.13 s but its own group reaches full alpha 3.97 s
      later, so it is first VISIBLE at settle+6.10 s -- the measurement is
      settle+2.13 s.
    boot ends on title + press_start at 161.99 s
    drew 16: ptbase2, ptloop01, …, ptcopyright
    overlay press_start at t = 261.00 units, drew 1: ptbtn00

The PNG shows the title logo with PRESS Ⓐ BUTTON under it — build 4 and build 2 in one frame, which this port had never drawn.

Two things the run made obvious and that are now fixed:

• The capture reported only the base build's elements. The first composited capture printed drew 16 and no mention of the plate, which reads as though the overlay had not drawn at all. The overlay gets its own line; folding its elements into the first list would have reported a screen that does not exist.
• --screen=<a> --overlay=<b> raises the same composite immediately, by the same code path, with no delay. It exists because the only other way to see two builds was a 156 s boot of which 137 s is the intro movie — and under Xvfb's software Theora decode that is several minutes to answer "is the plate on top of the title". It applies no delay: the delay is a measurement and lives in authored/flow.json. The boot-mode narration is suppressed there, because a log line that describes a sequence it is not running is worse than no log line.

P5 — the focus ring spins, 2026-08-29

The ring was drawn at 0° and the file said so: "THIS IS KNOWN TO BE WRONG, and is drawn anyway because the right answer is a guess." What was missing was the period, and it is now measured — docs/re/focus-ring-spin-measured.md (auto/no-disc-and-menu-captures at 4fa3099): a continuous spin, from eight evenly spaced autocorrelation peaks over nine revolutions, with no angle estimated anywhere — both angle estimators failed their own controls and were not used.

The period comes off the disc; the RE agent supplied only that it repeats

ptbtneff01 declares two keyframes that differ in nothing but rotation_deg, 0 → 360, the first timed at t = 120 and the second untimed. The port turns once per 120 units. Nothing is authored: the number is on the disc, and what the measurement adds is that the turn repeats rather than stopping at 360 = 0, which "groups hold" could not distinguish because those are the same pose.

ScreenView.spin_period_units is the rule, and it is structural and narrow: exactly two keyframes, differing only in rotation, by a full 360, first timed and second untimed. Disc-wide check over this export: 16 of 212 elements match, and all 16 are focus rings — ptbtneff01 on the five main-menu buttons and ptbtneff02 on the three EXTRAS buttons, in both locales, every one declaring t = 120. Zero false positives.

That check is the point rather than a formality. The measurement was taken on one button of one screen; a rule that also caught something else would be extrapolating it to elements nobody watched.

⚠️ It is a rule about shape, not a decoded field. Nothing on the disc says "this loops". The day a loop flag is decoded, this goes.

Verified on the port's own render, with the RE agent's own control

Captures at --time= 2.0 … 4.0 s on the settled main menu, ptbtn01 focused:

t=2.0 vs t=4.0 (one full period apart), whole frame	0.0000 / 255 — bit-identical
t=2.5, 3.0, 3.5 against t=2.0, inside the ring's box	3.60, 3.71, 3.58 / 255
sum of box luminance across eight phases	spread 0.027 % of the mean

The last row is deliberately the RE agent's own observable: they separated rotation from a brightness pulse by showing total annulus brightness is conserved while per-bin brightness moves. The port's render conserves it to 0.027 % (theirs was 0.4 % over 16 s, with capture noise in it). A filmstrip of the four quarter-period phases shows the bright head at top, right, bottom, left.

Two things it does not settle

• Direction. The port turns 0° → +360°, the sign the disc declares. No signed angle was ever measured — the estimator that would have given one failed its control and was not used.
• Phase across a focus change. The port drives the ring off the screen clock, so moving the cursor does not restart the turn. The alternative — the record's group restarting when the record is instantiated — is the stronger claim, and the oracle run held focus on one button throughout, so nothing separates them. Two frames straddling a focus change would.

P3, corrected — the plate needs no authored delay at all, 2026-08-29

Last iteration the port refuted the RE agent's authoring instruction ("when build 4 has settled, wait 2.13 s, composite build 2") with arithmetic off the disc, shipped the instruction anyway rather than pick between two of their numbers, and printed the discrepancy on every boot.

The refutation held, and the answer that came back is better than either option the port offered: author nothing. 5b0a6e6.

The premise that failed was the port's, and it will bite again

🔴 rest.t is not when a screen settles. It is the last hold keyframe before the exit.

Checked here rather than taken on trust. title's ptlogo1:

t=26  (-116,-7) 150%  a=0x00      the pre-roll
t=42  (179,186) 101%  a=0xe0      it has arrived
t=251 (184,193) 100%  a=0xff      5 px and 31 alpha steps later, 3.5 s on

It stops moving at t=42 and then creeps for 209 units. rest.t = 251 is the end of that creep, not the arrival. The title's visible build-in is over at t = 118, where pteff01, pteff02 and ptlogoall_eff finish together.

Every reconciliation the port computed last iteration was wrong by exactly that error: reading rest.t put build 4's arrival at 4.350 s instead of 1.967 s, and the "2.51 s, which is not a landmark of anything" that looked so damning is (4.350 − 1.967) + 0.13 — the error itself, wearing a decimal point.

One clock, and the interval is declared

	units
build 4's last build-in ramp	t = 118
ptbtn00 reaches a = 255	t = 238
difference	120 units = 2.000 s

Measured: 2.138 s and 2.132 s. The 6.7 % is presentation rate — 120 units in 2.135 s is 56.2 units/s, the emulator running 28.1 fps against a nominal 30, and the corpus had independently measured the idle title at 28.5 fps before these runs.

So authored/flow.json carries "clock": "shared" and no delay, boot.gd raises the overlay when the step's screen loads rather than at its settle, and overlay.time_units = view.time_units — assigned, not accumulated, because two independently advanced clocks drift by a frame here and there and the whole content of the finding is that 120 units is a fixed interval on one timeline.

⚠️ The general hazard, stated by the RE agent and worth repeating where the port will read it: discount a wall-clock number off that oracle by ~6 %. It is Canary's presentation rate baked into whatever it measures. A port at a true 30 Hz that authored 2.13 s would be visibly late.

Refutation — two of the RE agent's numbers for the same 120 units disagree by 2 %

Both findings measure the same declared quantity: 120 keyframe units of wall clock, during a static hold, in Xenia Canary.

		implied presentation
plate: settle → plate, two runs	2.138, 2.132 s → mean 2.135 s	28.10 fps
ring: one revolution, seven spacings	2.18 2.16 2.18 2.16 2.16 2.20 2.20 → mean 2.177 s	27.56 fps
disagreement	0.042 s = 1.97 %

That is seven times the plate finding's own run-to-run agreement of 6 ms, and it lands on the argument that finding uses to justify trusting itself: "the build-in is where frames are dropped; the static hold is not. A model in which the game's own timing varied would have to move both." Two static-hold measurements are exactly what should agree under that model.

A second, smaller arithmetic slip in the same place: the ring page reconciles 2.177 s against a band of "27.6–28.8 fps", saying the measurement "sits at the top of that band". It does not sit in it. 60 rendered frames at 27.6 fps is 2.1739 s; the mean needs 27.56 fps and the two slowest spacings (2.20 s) need 27.27 fps. Four of the seven spacings are above the band's top.

Verdict: the containment claim is refuted; the spin, the period and the reconciliation are untouched. Either the presentation rate genuinely differed between the two sessions — which the plate page's own corroboration argues against for static holds — or the ring's revolution is not exactly 120 units. The corpus should say which, because they are the same claim measured twice.

🟢 Nothing in the port moves either way. spin_period_units uses the declared 120 units at 60 units/s = 2.000 s of port time, which is the true-30 Hz value both readings agree the disc means. This is a corpus consistency problem, not a port one — which is why it is filed rather than worked around.

The corrected boot ended one build too early, and the capture showed it

Moving the plate onto the shared clock also moved the boot's exit, and the first capture taken afterwards was visibly darker than the one before it. The cause is pteff00, the title's black fade quad: it ramps 0xff000000 → 0x00000000 over t=16…261, so at t=243 — where the run was quitting, overlay.settle_time() after the overlay was raised — the frame is still ~7 % black.

The plate arrives at t=238; build 4 is not finished until t=261. The boot now ends at the later of the two, and says which in the log:

  -> title at 145.79 s
  overlay press_start raised at 145.79 s, 1 element(s), settles at t=238
  boot ends at 150.14 s, once both builds have arrived (t=261)

Worth recording because of how it presented: nothing failed, no warning was printed, and the only symptom was a frame slightly darker than the previous run's. A gate artifact that silently drifts is the failure mode this project keeps meeting — and it was caught only because there was a previous capture to compare against.

P7 — the new-game intro, 2026-08-29

S00A.wmv has been in export/video/ since P4 (MISSION §6 put both movies in scope at once). What P7 needed was for something to play it and for the run to end somewhere defined.

The port skips two measured screens, and says so on screen

The real chain is NEW GAME → DIFFICULTY → SELECT DATA → Ⓐ on a save slot → ~4.5 s → S00A (HANDOFF Q4 measured the screens, Q9 decoded the movie and then measured its onset off the running game at 0.96–1.000 with a strictly monotone playhead over 25 consecutive 0.5 s samples).

DIFFICULTY and SELECT DATA are measured destinations that are not GP_TITLE builds, so no screen file exists to go to. The port therefore jumps from NEW GAME to the one thing in that chain it has.

That is a gap, not a sequence, and the whole design here is about not letting it read as one:

• MenuFlow.accept returns a new kind, video, rather than folding this into blocked. The caller has to announce the skip, and a distinct kind is what forces it to.
• The runtime prints it every time: (NEW GAME) -> the real chain is DIFFICULTY -> SELECT DATA, then the movie. Neither screen is in this export.
• authored/flow.json carries skipped_chain as data, so the names of what is missing live beside the decision rather than inside a GDScript string.

A port that quietly jumped from NEW GAME to the intro would be showing a sequence the game does not have, with nothing on screen saying so. That is the exact failure this project keeps meeting from the other direction.

What happens after the movie is authored, and had to be

The game goes into mission 1. Gameplay is out of scope (PORT-MISSION §7), so "returns to a defined state" is a decision, and P7's gate says as much. The port returns to the title: the boot's own end state, so a run that finishes the intro lands somewhere a player can start again from. Nothing measured says the game does this, and after_video.kind is "authored".

The 4.5 s gap is left empty on purpose

Q9 measures the movie starting ~4.5 s after Ⓐ on the save slot. What is on screen for those 4.5 s was never observed — the run that would have shown it hit the documented sub_823070B0 cache crash after SELECT DATA.

GP_TITLE does carry a loading screen (below), and 4.5 s is about the right shape for one. That is precisely why it is in BLOCKED.md and not in flow.json: a plausible filler that nobody watched is the kind of thing that is indistinguishable from a measurement a month later.

A script timeout that would have failed every movie

--script's per-step timeout is 20 s, to stop an unattended run waiting forever on a screen that never settles. S00A is 93.9 s, so the first scripted new-game run would have been killed at step 1 and reported as "never settled".

Raising the constant would have been wrong in the other direction: a movie stuck at frame 0 would then hang the job, and a job that waits is worse than a job that fails, because it does not look like a failure.

So the test is liveness, not duration: while get_stream_position() advances, the deadline moves with it; a stalled movie still trips the same 20 s.

Found while looking: GP_TITLE's four unnamed builds are LOADING screens

build_00, build_01, build_12, build_15 have never had names. Every element in all four is pgloading_* — pgloading_processing.png, pgloading_circle1, pgloading_delta, pgloading_ring — and LOADING is one of the three screen names the RE agent read out of the title part's state function.

Two variants: 0/1 carry 7 elements, 12/15 carry 10.

They are not renamed here. The archive's own pairing (adjacent for 2/3, +3 for 4…9 and for 10/13, 11/14) suggests 0 is 1's twin and 12 is 15's, but which member of each pair is which locale is an inference, and a name is exactly the kind of thing that stops being questioned once written. Handed to the RE agent, who can answer it from a capture in one look. BLOCKED.md has the row.

⚠️ And one of them is a second casualty of the rest.t problem. pgloading_eff00.prm on entries 12/15 is a full-screen black quad whose group runs 0xff000000 at t=38 → 0xff000000 at t=48 → 0x00000000 untimed: black, held, then clear. Its rest.t is 38, where it is fully opaque. A port that draws that screen at its declared rest draws a black rectangle over the entire loading screen. The title's case only dimmed a frame; this one hides everything. Filed with the settle_time() row it belongs to.

Refutation — attempted on the fade-quad census; it survives, with a caveat

The claim (HANDOFF, on transitions): "in GP_TITLE exactly the six screen builds carry it while the six overlays do not", where "it" is the full-screen black .prm quad whose keyframe group is the transition.

The test, over the whole export: count builds carrying a full-screen primitive with black in its keyframes.

16 builds exported; 12 carry one.
Of the 12 `is_build` bundles (excluding the 4 authored splashes): 8 carry, 4 do not.
  carry:  title, title_jp, main_menu, main_menu_jp, extras, extras_jp,
          build_12, build_15
  do not: press_start, press_start_jp, build_00, build_01

8 and 4, not 6 and 6. But the two extras are build_12 / build_15, and their quad is a different shape:

	transition quad (pteff00.prm, title)	loading quad (pgloading_eff00.prm)
	0xff000000 t=16	0xff000000 t=38
	0x00000000 t=261	0xff000000 t=48
	0xff000000 untimed	0x00000000 untimed
shape	black → clear → black	black → held → clear

The transition quad returns to black on exit; the loading quad does not. Read strictly — the quad whose group is the transition — the claim holds.

Verdict: survives. The refinement is worth recording anyway, because the naive test over-counts by two and somebody will run the naive test. There are two kinds of full-screen black .prm in GP_TITLE, and only one of them is a transition.

P7 gate

godot --path port -- --menu --script=accept --audio=…/p7.wav

  menu on main_menu, focus ptbtn01
script[1] accept
  (NEW GAME) -> the real chain is DIFFICULTY -> SELECT DATA, then the movie.
               Neither screen is in this export.
  -> video S00A at 1.18 s (/work/export/video/S00A.ogv)
     video ended at 94.93 s
     -> title (authored: authored)
  menu on title, focus (none -- this screen has no focusable item)
script complete after 99.28 s on title
recorded 98.453 s of Master bus (driver Dummy)

The movie ran 93.75 s against a declared 93.9 s, the run ended on the title, and the Master bus recorded 98.453 s: pcm_s16le, 44.1 kHz stereo, RMS −22.2 dBFS.

What this does not show, stated because it would be easy to imply otherwise: the recording contains the menu bed and the movie together, and this run did not separate them. So it establishes that the engine reached an output for 98 s of a run whose middle 94 s was a movie — not that S00A's own audio track is in the mix. Separating them wants the P6 null-control method (a paired run that differs only in the movie), and that is not done here.

🔴 Peak 0.0 dBFS again. The same runtime-headroom problem P6 filed: per-file levels are the disc's and are fine, the Master bus has no headroom, and the port has set no bus balance because nothing measures one.

One more file read while it was being written

ls reported the recording as 3 702 828 B; ffprobe on the finished file reports 17 367 084 B / 98.452608 s — a factor of 4.7. ffprobe is right and the ls caught it mid-flight.

AUDIO-VERIFICATION.md opens by naming this failure and the port has had the temp-name-then-rename discipline since P6, which is what makes it worth writing down rather than shrugging off: the discipline protects a reader who opens the path, and it does not protect a reader who stats it at the wrong moment. Size on disk is not a measurement of a file somebody else is still writing. Ask the decoder, not the directory entry.

Modding — rule 4 was never implemented, 2026-08-29

docs/port/MODDING.md is explicit that modding is "a design constraint on the exporter today — not a milestone to add later", and its rule 4 is base-and- overrides: a mod replaces a file by shadowing its path, so a modder edits nothing under the derived tree and re-exporting is always safe.

Nothing read data/mods/ at all. The directory has existed since the monorepo merge with a .gitkeep in it and no code path anywhere — exporter or runtime — that looked at it. Eight milestones shipped past that.

One resolver, and every read goes through it

ExportTree.resolve(rel) returns the mod tree's copy when one exists and the derived tree's otherwise. read_json, texture, video and MenuAudio all call it, so a mod can replace a screen's JSON, a sprite, a cue, the music bed or a movie — every asset kind the port reads.

MenuAudio was reading tree.root.path_join(...) directly and had to be changed. Left alone it would have made audio the one asset kind a mod could not touch, for no reason a modder could have guessed — which is the failure mode rule 4 exists to prevent.

There is deliberately no manifest of what a mod contains and no registration step: the path is the registration, which is the whole of the rule.

⚠️ One tree, not a stack. Several mods layering over each other needs a load order, and a load order needs a rule nobody has asked for. Said out loud in data/mods/README.md rather than answered.

A modded run must not look like an unmodded one

Every shadowed file is printed the first time it is read:

mod: sprites/title/main_menu/ptbtn01.png  <-  /work/data/mods/sprites/…/ptbtn01.png

MODDING says "did I break it?" is answered by disabling a mod. That is a fine last resort and a poor only resort, so the log names the replacement instead.

The first version of this got it wrong in an instructive way: it printed a summary in _ready, before a single asset had been read, and so always said (nothing shadowed yet). A report structurally incapable of reporting anything is worse than no report, because it looks like an answer. It now announces each shadow at the moment it happens.

Gate

A synthetic 203×43 magenta PNG — nothing disc-derived — dropped at data/mods/sprites/title/main_menu/ptbtn01.png:

pixels changed between the two renders	8 501 of 921 600 (0.92 %)
bounding box of the change	x 542…744, y 162…204 — 203×43, the sprite's own size
sylpheed-export check export afterwards	16 screens still validate

The changed region is exactly the sprite and nothing else moved.

data/mods/ was not gitignored, and that is a hole in a hard rule

"Never commit game assets" has been enforced on export/ and data/base/ since P0. But a mod is usually an edited game asset, and data/mods/ was fully tracked — so the one directory a user is invited to put modified sprites in was the one directory git would happily take them from.

.gitignore now excludes everything under it except the README.

The naming split is not mine to resolve

MODDING.md describes the tree as data/base/; PORT-MISSION.md §3, the exporter, ExportTree and .gitignore all say export/. Both are mission files, and PROTOCOL is clear that only the human changes a mission, so this is raised rather than picked. .gitignore has ignored both names on purpose since P0.

It matters here for one concrete reason: MODDING's layout has base/ and mods/ as siblings, and today they are not — the tree is export/ at the repo root while mods are data/mods/. The resolver takes SYLPHEED_MODS or defaults to data/mods/, which is what exists; if the tree is ever renamed to data/base/ the sibling rule becomes natural and that default can go.

Refutation — the paint-order key, and the reach of its tie-break

The claim (HANDOFF Q3): paint order is "a u16 layer key at +0x0A, decoded", with the tie-break filed 🟡 as "eight candidates refuted; costs one element's blend on one screen".

First pass: 2 of 16 screens did not match a stable sort by layer key — both loading screens, build_12 and build_15.

That was my test, not the claim. pgloading_eff00.prm carries no layer key at all — layer: null, layer_source: "none": it is a primitive with no sprite header, and the exporter's implied-name fallback produces nothing either. My sort put a keyless element first; the decoders put it last.

Completing the rule as "stable sort by layer key, elements with no key last" gives 16 of 16. And last is right: pgloading_eff00 is the full-screen black quad, and HANDOFF's own sentence is that the fade quad paints last.

Verdict: survives, with the rule completed. Worth recording because the published statement does not say where a keyless element goes, and there is at least one in the archive.

🟡 But the tie-break's reach looks understated. Census over this export:

elements sharing a layer key with another element: 105, across 12 of 16 screens

HANDOFF characterises the cost as "one element's blend on one screen". 105 elements on 12 screens is a much larger surface than that. Most of those ties are probably invisible — two elements that share a key and never overlap cannot show a difference — but probably is doing the work in that sentence, and nothing has measured which. The port is unaffected either way: it draws ui_layout::derived_paint_order verbatim and derives no order of its own.

Correction — the runtime "clipping" I flagged 🔴 twice was overstated

P6 and P7 both filed 🔴 "the runtime mix has no headroom" on the strength of a peak reading of 0.0 dBFS off the Master bus. Measured properly:

	samples at full scale	of total	longest clamped run
P6 walk (5.944 s)	43	0.0082 %	10 samples — 0.23 ms
P7 new-game run (98.453 s)	24	0.00028 %	11 samples — 0.25 ms

That is not a headroom defect. It is the disc's own confirm cue, mastered near full scale (+0.18 dBFS after a lossy decode), touching the ceiling for a quarter of a millisecond on a transient — and possibly only in the recording's 16-bit conversion, since Godot mixes in float and AudioEffectRecord saves s16.

Nothing is changed, and that is the point. Attenuating the mix to buy headroom would be an unmeasured decision about level — the same class of thing this port refused for the BGM loop point and the stem balance. Refusing it there and taking it here would be inconsistent, and it would trade an inaudible 0.25 ms clamp for an audible change nobody measured.

A peak reading is not a clipping measurement. One sample at 0 dBFS and two seconds of square wave give the same number, and I reported the first as though it were the second — twice, in red, in two milestones' write-ups.

The P1 regression harness had been broken since the monorepo merge, 2026-08-29

tools/port/verify-screen is the P1 gate's regression detector: Godot's drawing of a screen against sylpheed-cli screen render of the same build. It had not been run since P1, across four milestones that changed the renderer — rotation, the focus record, the spinning ring, two builds composited at once.

It could not have been run. It resolves its reference binary to a path that build-reference-cli stopped being able to produce. That script greps crates/sylpheed-export/Cargo.toml for

sylpheed-formats = { git = "…Syplheed-Reborn.git", rev = "…" }

and the monorepo merge (65cefa7) replaced that line with { path = "../sylpheed-formats" }. The grep returns nothing, the script exits 1, and the binary left at reference-cli/sylpheed-cli is whatever predated the merge — here, three hours older than the sources and built from a revision nothing in the tree points at any more.

Running the diff against it would have compared the port to a decoder from another era and called the result a regression check. DECISIONS.md already carries "The reference renderer was stale for three diff runs" from P2. This would have been the fourth, and the mechanism was different: not a forgotten rebuild, but a build step that could no longer succeed and a consumer that only checked whether the file existed.

The fix is a deletion, not a repair

The revision-keying solved a two-repo problem: /reborn's target/ was a live mount of the other agent's checkout and moved mid-run, so a pixel disagreement against it had a free variable in it. The monorepo removed that problem by construction — the exporter, the reference and the port now read one decoder, the working tree's. So verify-screen builds sylpheed-cli from the workspace. SYLPHEED_CLI still overrides for anyone who wants to pin one deliberately.

The baseline, all 16 screens

build_00/01        max 3    over3 0       OK
press_start(_jp)   max 1    over3 0       OK
title              max 6    over3 790     DIFFERS
main_menu(_jp)     max 4    over3 0       DIFFERS
extras(_jp)        max 3    over3 0       OK
publisher_logo(_r) max 1-2  over3 0       OK
developer_logos(_r) max 2   over3 0       OK
title_jp           max 155  over3 20498   DIFFERS
build_12/15        max 0    over3 0       OK

No new drift. Four milestones of renderer change and the only screen with a substantial disagreement is title_jp — which is the same one P1 recorded and left open: ptlogo_eff2 is the single drawn element in the whole export at a scale that is not a whole multiple of 100 % (125 %), and the two renderers pick different source texels there. ui_layout::blit samples at the destination pixel's top-left corner, a GPU at its centre. The port has still not changed to match, because matching would mean reproducing a half-pixel bias on purpose to make a number smaller. Only an oracle capture settles it.

title's 790 pixels at ≤ 6/255 are the same class, one texel wide, on the logo's scaled edges. main_menu and main_menu_jp say DIFFERS on a max of 4 with zero pixels over the bar — a couple of pixels differing in a single channel.

max alone could not tell 2 pixels from 25 000

The script reported only the largest difference anywhere in the frame, so main_menu (two pixels) and title_jp (2.8 % of the frame) produced the same verdict. It now also reports how many pixels are over the bar.

The bar itself is not raised. Tuning a threshold until things match is the failure the script's own header warns about; adding a second number is information, not a loosened bound. ⚠️ The count is thresholded on greyscale luma while max is a per-channel maximum, so they are not two views of one measurement — a per-channel check counts 957 on title where the luma count says 790.

What this harness cannot see, stated because the OK rows look reassuring

It renders --pose=rest. That is deliberate — it holds both renderers to the same declared pose so the test is port vs reference and not rest vs timeline — but it means none of this iteration's or the last four's visible work is under test: not the spinning focus ring, not the plate composited over the title, not any timeline behaviour, not audio. Sixteen OK rows are a statement about the resting composite and nothing else.

And it remains what its header says: a consistency check between two renderers that share their assumptions. Both have been wrong together three times — pteff05, scale-0, rest() — and each time only a capture caught it.

Refutation — "builds 0/1 and 10/11 are the loading screen" is false in the index space this export uses

The claim, from the RE agent 2026-08-29, answering the port's ask to name GP_TITLE's unnamed bundles: "builds 0/1 and 10/11 are the loading screen, decoded from their own pgloading_* element names."

In this export, entries 10 and 11 are the splash screens, and it is not close:

entry	elements
10	palogo_eff0, palogo_sqex, palogo_sqex_eff
11	palogo_eff0, palogo_gamearts, palogo_seta, palogo_anima …
12 / 15	pgloading_eff00, pgloading_loop1, pgloading_str …

Entry 10 is the SQUARE ENIX wordmark and 11 the developer logos — which the same agent identified, in the answer to the port's ask 1, as "entries 10/13 are the SQUARE ENIX publisher wordmark, the first thing the boot shows".

Verdict: the finding is almost certainly right and the index space is wrong. Over the twelve bundles is_build accepts — entries 0,1,2,3,4,5,6,7,8,9,12,15 — ordinals 10 and 11 are entries 12 and 15, which are exactly the two dressed loading variants. So "0/1 and 10/11" is the is_build ordinal, and this export addresses by pak entry index.

Why this is worth a section rather than a shrug. authored/screen_names.json is keyed by entry index, and the exporter's own comment says why: "keyed by ENTRY, not by the enumeration ordinal — widening the enumeration to reach the splash renumbers the ordinals, and a name that moves when the rule changes is not a name." Someone reading that message and writing keys "10" and "11" would name the publisher wordmark and the developer logos as loading screens, and the export would validate, and the boot would still run.

Two enumerations of the same archive differ by exactly the four bundles the port had to add an allow-list to reach. That is the sharpest possible demonstration of why the exporter switched, and it has now nearly caused the error it switched to prevent. Reported; the names are still the RE agent's to give.

The intro's missing dialogue was an export gap, not a transcode bug, 2026-08-29

A human play-test heard music under the boot intro and no voices. The obvious reading is that the 5.1→stereo fold dropped the centre channel, and it is wrong.

ADV.wmv carries music and effects only. On this disc a cutscene's voice is a separate asset: one continuous XMA stream in sound.pak, bound to the movie by the manifest in tables.pak (ADV → VOICETRACK = VOICE_ADV). Nothing was dropped — grep -rn voice crates/sylpheed-export/src/ returned nothing, because the exporter had never been asked for it. The transcode was correct the whole time, which is why every measurement on it passed.

That is worth stating plainly because the failure looked exactly like a codec bug, and docs/port/AUDIO-VERIFICATION.md is full of ways to measure a transcode against its source. Every one of them would have come back clean.

The binding is resolved, and must never be matched by name

audio::export_voice takes exactly one route: media::resolve_movie_voice_region(source, movie, VoiceLang::English), which walks movie → cue token (manifest) → sound id (registry) → a [start, end) byte region of the continuous stream. The cheap route — read VOICE_<movie>.slb — was not taken, and the reason is a measurement:

movie	resolved region	inside the bank named after it?
ADV	433 930 240…437 044 592	yes
S00A	452 798 464…455 499 120	yes
RT01A	437 044 592…437 345 648	no — it is inside VOICE_ADV.slb

⚠️ Name-matching is correct on exactly the two movies this port ships, and wrong on the radio cutscenes. It would have exported clean, verified clean against both in-scope movies, and returned the wrong recording the moment anybody widened the export. This is the failure mode MISSION §2 names — one playable thing is not one archive entry — in its most convincing disguise: the spot-checks a person would actually run are the ones it passes.

Three choices, and why none is a guess

• One file per movie, per MODDING rule 1, and the region's chunks are summed — see the correction below, because the first version of this paragraph said the opposite and was wrong.
• Mono, folded from the stream's own declared channel count, probed with ffprobe rather than assumed. This is not pedantry: pan silently ignores a channel the input does not have — measured this iteration on the 5.1 fold below, where FLC/FRC/SL/SR vanished with no warning at all — so a stereo matrix applied to a mono voice track is not an error, it is a −6 dB attenuation that nothing reports. A track that is already mono is passed through untouched.
• No sync offset, and no length clamp. The voice plays from the video's first frame, so nothing is authored. The decoded length is recorded in the manifest beside the movie's own length rather than trimmed to it: the voice has no shared container to disagree with, so a length mismatch is the only symptom a resolution error would ever show, and clamping would delete it. That decision is the reason the error below was caught in the same hour it was made.

Correction, within the hour — the chunks are stems, and I had concatenated them

The first version of export_voice joined the region's chunks end to end and produced 359.201 s of voice for a 137.437 s movie, and 255.460 s for a 93.779 s one. Both ratios sit near 3, and both regions decode to 3 chunks.

The manifest said so on the first run, because the length was recorded against the movie's instead of being clamped to it. A clamp — which is what sylpheed-viewer does, and what media's own doc comment invites with "trimmed by the caller's length clamp" — would have produced a file of exactly the right duration containing the wrong audio, and every check in docs/port/AUDIO-VERIFICATION.md would have passed it.

Decoding each chunk and timing it (crates/sylpheed-export/examples/voice_chunks.rs):

movie	movie length	chunk 0	chunk 1	chunk 2
ADV	137.437 s	84.553	137.324	137.324
S00A	93.779 s	68.072	93.694	93.694
RT01A	—	0.009	34.034	—

Chunks 1 and 2 are equal to six decimals and each span the whole movie. That is HANDOFF Q10's decoded shape — two stems of one performance, played together; do not concatenate — showing up on a second asset kind. They are summed at 1/n, exactly as export_bgm sums a music bank.

⚠️ Chunk 0 is dropped and its status is open. Its duration matches nothing: 84.6 s under a 137 s movie, 9 ms under RT01A. docs/re/REFUTED.md records to_xma_riffs's hybrid branch emitting a leading headerless packet region ahead of the real RIFF waves, and docs/port/BLOCKED.md already carries that as an open row against BGM_103, where media returns three sub-waves against a census of two. This is the same signature on an independent asset kind — good corroboration, not proof, and the port is not entitled to close it. So the selection rule is written in terms of the measurement (keep the longest duration and everything tying with it), and every dropped chunk is named in the manifest with its length.

This is the media-assembly trap MISSION §2 names, and it caught me: I wrote a doc comment asserting concatenation, gave the reason, and had it wrong. What saved it was refusing to clamp — the one decision in the first version that was made for the right reason.

What a None means

A movie whose region does not resolve is genuinely unvoiced — the honest answer for most hokyu_* resupply cutscenes — and gets a manifest warning, not a substitute. The corpus already paid for the alternative: resolving unbound movies through a shared demo line played the wrong recording.

This is decoded, not authored, so it runs outside the authored/audio.json block in main.rs. Nothing new goes in authored/; there is nothing here we decided.

Refutation, of my own exporter — MISSION §6 pins a downmix matrix, and the exporter ships a different one

The claim under test is the port's, not another agent's, and it has been in video.rs since P4: that the 5.1 fold is normalised by 1/(1 + √½ + √½) = 0.4142 because "the unnormalised form was measured too and clips: peak 0.0 dBFS."

That sentence rests on a peak reading. docs/port/BLOCKED.md records this port withdrawing a 🔴 runtime-clipping flag on precisely the grounds that a peak reading is not a clipping measurement — one sample at full scale and two seconds of square wave give the same number. So the justification for deviating from a matrix a human pinned was produced by an instrument this port has already declared unfit for the question.

Measured properly, over the whole of both movies

Decoded to 32-bit float so nothing is pre-clamped, then counted: samples at or over full scale, how many exceed it by more than 1 dB, and the longest consecutive run.

	peak	RMS	≥ full scale	> +1 dB	longest run
ADV, MISSION §6 matrix	+4.26 dBFS	−14.55	4 406 / 13 187 900	1 874	16 samples (0.333 ms)
ADV, exporter's matrix	−3.39 dBFS	−22.21	0	0	—
S00A, MISSION §6 matrix	−1.34 dBFS	−18.73	0	0	—
S00A, exporter's matrix	−8.99 dBFS	−26.39	0	0	—

The claim survives, and the reasoning behind it does not. The pinned matrix genuinely overloads ADV: not one stray sample but 4 406 of them, 1 874 more than a full dB over, wanting 4.26 dB more headroom than the container has. That is a different animal from the 43 samples and 0.25 ms transient I withdrew a flag over, and the number that separates them is the magnitude, not the count.

But the same table refutes the scope of the fix. S00A never clips under the pinned matrix — it peaks at −1.34 dBFS. The exporter attenuates it by 7.65 dB to solve a problem it does not have, because 0.4142 is derived from a theoretical worst case (every channel correlated at full scale at once) that neither movie comes near.

Control, before believing any of it

The pinned matrix names FLC, FRC, SL and SR, and a 5.1 source has none of them. ffmpeg neither errors nor warns — measured at -loglevel warning, the output was empty. So the literal string was decoded alongside its three-term 5.1 reduction (FL = 1.0·FL + 0.707·FC + 0.707·BL) and the two outputs compared: bit-identical, 52 751 600 bytes. The reduction is what runs, and it is the matrix §6 intends. That silence is itself the trap the mono fold above guards against.

Not changed, and deliberately so

MISSION §6 is a human decision of 2026-08-29, and the level of a mix is exactly the kind of thing §6 reserves — "adjust it deliberately, as a commit". Three options, and choosing between them is not mine:

1. Keep the pin. ADV clamps on 4 406 samples. Rejected on the measurement.
2. Keep the exporter's 0.4142. Preserves the two movies' relative loudness exactly, costs 7.65 dB, and is safe by construction for any movie a modder drops in.
3. One measured constant, 1/1.6339 = 0.612. The smallest single scalar under which no in-scope movie clamps: +3.39 dB over today, still one constant so relative loudness is untouched. Tuned to two files, but the exporter's own check refuses any export whose peak reaches 0 dBFS, so a third movie that needed more headroom would fail loudly rather than clamp quietly.

Per-file normalisation is not on that list: it would put ADV 4.26 dB below S00A and change how two cutscenes sit against each other and against the menu bed, which is an aesthetic decision with nothing measured behind it.

What changes today is only that the deviation is visible: video.rs now cites MISSION §6 by name and says it departs from it, and the export carries a manifest warning with these numbers. Before this, a reader of the manifest could not tell that a pinned human decision had been overridden at all — the command line was recorded faithfully, and recording the command you ran does not disclose that it is not the command you were given.

The voice reaches the output, and a null control says so quantitatively

+ voice ADV in the log proves only that play_voice found a stream and called play(). Whether the audio arrives at the Master bus is a different question, and docs/port/AUDIO-VERIFICATION.md §2 exists because it is.

The control needed no test-only code: MODDING rule 4 already shadows any exported asset by path, so 140 s of silence dropped at data/mods/audio/voice/ADV.ogg mutes the dialogue and changes nothing else. Two --boot --skip-at=25 --audio=… runs, then astats over the same 14 s of movie:

	peak	RMS
ADV.ogv's own audio (the bed)	−6.239	−24.941
the exported voice alone	−7.614	−27.965
run with the voice muted	−6.251	−25.126
run with the voice playing	−5.415	−22.913

The muted run reproduces the bed to 0.01 dB peak / 0.19 dB RMS, which is what makes the other row worth reading. And the mixed run is not merely louder: two incoherent sources at −24.941 and −27.965 dBFS predict a sum at −23.184, and the run measures −22.913 — 0.27 dB out. The voice is in the mix, at the level its own file says it should be.

⚠️ Under the Dummy driver. Per AUDIO-VERIFICATION, "recorded under a dummy driver" is a weaker claim than "heard", and no measurement here says the recording is the right dialogue for this cutscene — only that the file the exporter resolved is the one reaching the output at the expected level. The two runs are also not sample-aligned (they differ by 1.7 s of wall clock), which is why the RMS trough column is omitted: it moved by 40 dB between runs on window placement alone, and peak and RMS are the two numbers that survive that.

Ⓐ does skip the intro in this build, so the play-test's report is not this bug

--skip-at=25 on a --boot run: video skipped at 25.02 s, video ended at 25.02 s, title at 25.02 s. The press goes through Input.parse_input_event and arrives at _unhandled_input exactly as a pad's would, so the wiring from press to skip is live. What that does not cover is a real key event from a focused window, which is the difference between this run and the human's — and, separately, whether the game permits skipping an attract movie at all is HANDOFF Q9 and still 🟡. If the answer is no, this path is deleted rather than debugged.

Refutation of my own two-stem reading — and it had already been adopted elsewhere

Two hours after writing that a voice region's equal-length chunks are "HANDOFF Q10's decoded two-stem shape", the Decoder asked me to decode the leading chunk — it has no XMA1 decoder in its container — and the decoder run refuted the claim I had made.

Equal duration was a shape match, and I carried Q10's music census across to voice on the strength of it. The content does not support it:

S00A chunk 2	digital silence — 4 497 300 samples, peak −inf
ADV chunk 2	0.60 × chunk 1 (best-fit scalar), residual 26.8 dB below the target

About 95 % of ADV's second chunk is a −4.4 dB copy of the first. Two chunks of equal length, one silence and the other a scaled near-duplicate, are not two stems of one performance. ⚠️ The claim had already travelled — it is quoted in the Decoder's voice-region-leading-chunk.md — which is the failure PROTOCOL names: a wrong belief moving faster than its correction, through two documents that share a source.

What it cost, and what changed

Summing chunk 1 with silence at 1/n put S00A's dialogue 6.02 dB down for nothing: the exported file peaked at −16.2 dBFS against a source chunk peaking at −4.2. export_voice now drops a digitally silent chunk before the sum. That is arithmetic, not a content judgement — a silent input contributes nothing to a mix and counting it in the normalisation is simply my error.

What ADV's near-duplicate chunk 2 is remains open and it is still summed. Whether the game plays both is a decoding question; 26.8 dB of residual is not nothing, and dropping a chunk because it correlates with another would be answering it.

The leading chunk, decoded — structure, and not one word about content

The Decoder's ask was "cutscene dialogue or mission dialogue". ADV region

• 1392, 394 packets: 84.553 s, stereo, 48 kHz, peak −2.48 dBFS, RMS −24.80, with 6 silent gaps over 0.4 s below −50 dB totalling 45.3 s — 54 % silence, the same duty cycle as the two full-length chunks (54 %, 55 %). So it is speech-structured audio: not a header, not padding, not noise.

🔴 Which is as far as a measurement goes. Cutscene or mission is an identification and this agent has no ears and no oracle. Envelope cross-correlation against the full-length chunks peaks at 0.768 at the last lag in the search range, which is where a statistic lands when it has found nothing, and it is not evidence. The Decoder's 🟡 stands, and its own leading hypothesis — an in-mission VOICE_D_* line — is untouched by any of this. The byte-span test it already built settles it the moment those regions are enumerated; nobody has to listen.

Taken from the same message: bank_header_len, not riffs.len()

The Decoder's census warns that eight bank-header regions also yield three chunks, so the chunk count cannot say which structure you are in. This exporter never used the count — it selects on decoded duration, which is why it already handles both cases: RT01A's 10 300 B leading chunk decodes to 9 ms and falls out on its own. But a duration tie is an observation and bank_header_len is decoded, so the rule switches the day c1f3608 reaches main. sylpheed-formats is a path dependency and merging another agent's topic branch is not the port's to do.

The mono fold I warned about, in the comment directly above the code that did it

export_voice's first version folded to mono by averaging every declared channel, and the doc comment above it said, in as many words, that "pan silently ignores a channel the input does not have — so a stereo matrix applied to a mono voice track is not an error, it is a −6 dB attenuation that nothing reports."

It then did exactly that. Per-channel astats on both voice streams:

	channel 1	channel 2
ADV chunk 1	peak +0.000 dBFS	peak −inf
S00A chunk 1	peak −4.207 dBFS	peak −inf

The voice is a mono recording carried in a nominally stereo stream, and averaging it with silence cost 5.94 dB — which is most of why S00A's exported dialogue sat at −16.2 dBFS against a source chunk peaking at −4.2 (the other 6.02 dB was summing a silent chunk, corrected in the same iteration).

Checking the declared channel count is not checking the content, and only the content is the fold. live_channels now measures which channels carry signal and averages only those. sylpheed-viewer's pan=mono|c0=c0 reaches the right answer here for a reason it does not state; this reaches it for a stated one, and would still be right if a stream ever did carry two live channels.

Worth recording as a pattern rather than a bug: three defects this iteration were all the same shape — a silent chunk in a sum, a silent channel in a fold, and a pan matrix naming channels that do not exist. Each is an input that contributes nothing being counted in a divisor, and none of them is visible in anything but a level.

The leading chunk is the TAIL of the full one — measured, and it is why the region over-covers

The Decoder settled by byte-span analysis that a voice region's leading chunk is the movie's own dialogue, 17 of 17 — killing its own standing hypothesis that it was an in-mission VOICE_D_* line — and asked whether dropping it is therefore a truncation. It has no XMA1 decoder; this container does.

Envelope cross-correlation, sliding with overhang allowed at both ends and normalised over the overlap only. ⚠️ This corrects an earlier number of mine: a first pass scored 0.768 and I called it nothing, correctly — that search only tried lags where the shorter chunk fitted wholly inside the longer one, and it peaked on the boundary of its own range.

	best r	at lag	overlap
ADV chunk 0 → chunk 1	0.998	+52.8 s	84.5 s
S00A chunk 0 → chunk 1	0.932	+25.6 s	68.0 s
control — ADV chunk 0 against itself	1.000	0.0 s	—
control — ADV chunk 0 against S00A chunk 1	0.289	—	28.2 s

Both lags put chunk 0 flush against the end of chunk 1: 52.8 + 84.55 = 137.35 s against chunk 1's 137.324, and 25.6 + 68.07 = 93.67 against 93.694.

Confirmed in the sample domain — lag refined to ±1 sample on the loudest second, then a scalar best-fit over the whole overlap: ADV +52.8000 s, gain 0.833, residual 16.70 dB below the target; S00A +25.6320 s, gain 0.365, residual 23.15 dB. 98–99.5 % of the energy is a scaled copy: the same material at a different gain, not bit-identical, which is what a lossy decode at two gains should look like.

So dropping chunk 0 removes a duplicate, and is not a truncation — the exporter's existing behaviour is right for a better reason than the one it gave. 🟡 The manifest note has NOT been rewritten to say so. The structural claim — that the region over-covers because it re-presents its own tail, and that this accounts for the whole 2.6× — is the Decoder's to write down; this page reports the measurement and says which is which. The note stays hedged until its page carries the conclusion, and the hedge is true either way.

⚠️ The 504 464 B constant was deliberately not converted. The Decoder found the region anchor sitting that far after the true predecessor trailer on all 17 and pointedly declined to call it missing dialogue. Converting it needs a byte↔time mapping, and the numbers above are the reason there isn't one: chunk 1 is 1 118 268 B and chunk 2 is 1 171 516 B for the same 137.324 s, so bytes per second is not constant even inside a single region. Any figure in seconds off that constant would be invented.

Third reading of a voice region, and this one is decoded: three presentations of one take

export_voice has now read the same bytes three ways in one session, and each reading was ended by a measurement rather than by an argument:

1. Concatenate the chunks — 359 s of dialogue for a 137 s movie.
2. Sum them as HANDOFF Q10's two stems — refuted here: S00A's second full-length chunk is digital silence, ADV's is 0.60 × the first with 26.8 dB of residual.
3. Keep one stream. ✅ This one is decoded, and not by me.

The Decoder settled the shape disc-wide without a decoder, by counting stream starts inside every inter-descriptor span: 258 spans hold one stream, 28 hold three, and nothing holds two or any other number. The 95 movie-voice regions decompose 70 + 8 + 17, and the 8 are independently the same 8 its first census flagged. So a region carries three presentations of one take — which is exactly 359 = 84.55 + 137.32 + 137.32, the first clipped by its crate's own 1.5 MB predecessor guard.

It also cross-checked my correlation by a route needing no decoder: if the leading chunk is the tail of a full stream, the whole leading stream should be one complete take, and ADV's 504 464 + 808 304 = 1 312 768 B at chunk 0's byte rate is 137.323 s against my measured 137.324. Two instruments, no shared assumption.

So summing was wrong for a third reason: a take plus a 0.60 × copy of itself is ~4 dB louder and coloured, not a mix of parts. The exporter keeps one stream and performs no arithmetic on it.

🟡 Which stream is a recommendation, not a decoded field. The selector is the highest byte rate among the equal-duration survivors, on the Decoder's advice. Nothing on the disc says which presentation the game plays, and on ADV this picks the quieter of the two — −8.3 dBFS against 0.0. That is in the manifest in those words so the choice is visible and reversible; it is the one part of this that a capture could still overturn.

check moves voice off the strict peak bound as a consequence. It sat with bgm because it was a sum this exporter produced; it is now a single wave off the disc, mastered near full scale — ADV's louder presentation measures +0.0003 dBFS at source — and refusing that would be refusing the disc's own mastering.

The 504 464 B constant: I refused the conversion, and refusing was right

The Decoder asked whether I would spend a decode converting its anchor offset to seconds, and I declined because bytes per second is not constant even inside one region. It has since found the stronger reason and withdrawn the ask: the constant is structural, not proportional — identical on all 17 regions despite their differing durations. A proportional prediction lands within 8 bytes on ADV, which is a coincidence, and is 4 305 B out on S00A. A seconds figure off that constant would have been invented, and it would have looked corroborated on the first movie anybody checked.

❔ Why the disc stores three presentations at all is unanswered, by either of us.

The transcode cache had never hit, because the wipe ran first

video::transcode has carried a cache since P4. It writes a .cmd sidecar with the exact ffmpeg command, the source's byte count and its channel count, and skips the encode when all three still match. Its doc comment says why: "without it every re-export pays ~4 minutes to produce a byte-identical file, and an exporter nobody re-runs is worse than a cache."

It had never hit once. main.rs clears the output tree wholesale — and the remove_dir_all runs immediately before the check, deleting the sidecar and the output it stamps. The cache tested a file it had just erased.

This session ran the exporter six times and paid the full Theora encode every one of them, producing five byte-identical files. Roughly 48 minutes. Nothing reported it, and nothing could have: a cache is silent when it works and silent when it does not, and the only symptom is a wall-clock cost that looks like the job simply being slow.

⚠️ It is worth being specific about how this hid, because the ingredients are ordinary. The cache is correct. The wipe is correct. Each carries a doc comment explaining itself, and neither mentions the other. The defect exists only in their ordering, which is stated in neither, and the cost is invisible in every artefact the export produces — the tree is byte-identical either way.

The fix keeps the wholesale guarantee rather than trading it away

The obvious repair — stop wiping — would break what the wipe is for: a screen that stops being exported stops existing, rather than lingering as a stale file that still validates. So the wipe now spares exactly video/, and prune_videos deletes anything in it this run did not claim. Everything else is still cleared outright.

That is a cache, not a hand-edit, and the distinction matters against MISSION §3: nothing in export/ is authored, the sidecar is derived from the command the exporter itself computed, and any change to the command, the source size or the channel count re-encodes. A modder who edits an .ogv by hand gets it overwritten on the next export, exactly as before.

🟡 Not measured yet: that a cached run reproduces the same tree. The claim is structural — the skip is keyed on the whole command string — but "the second run produces the same bytes" is checkable and has not been checked.

settle_time() — the answer arrived, and it refutes my own 🔴 more than it confirms it

The Decoder took the port's top ask and measured the boot on a cold profile with no shader cache (auto/no-disc-and-menu-captures at 4bd4779, docs/re/boot-settle-times-measured.md). It confirms the principle I filed: the title's rest.t is 251 units = 4.183 s where its art is finished at about 2 s, so rest.t is not when a screen arrives.

But my row said more than that, and the extra part is wrong. It said "everything the boot sequencer paces off that landmark is therefore late", and named publisher_logo and developer_logos. So I measured the port the way the game was measured — visible span, not arrival-to-arrival — with --film at 4 fps and a per-frame greyscale mean:

	port, visible span	game, three cold boots
publisher wordmark	4.25 s	4.297 / 4.604 / 4.370	0.05 s under the lowest
developer logos	3.50 s	3.508 / 3.503 / 3.366	dead on
black hold between	≈0.25 s	0.2 – 0.3 s	inside
title settled → plate	2.000 s (declared 120 units)	2.247 s	inside, at ~28 fps presentation

The splashes are not late. They match. ⚠️ And the reason my earlier reading said otherwise is worth keeping: I had compared the port's transition timestamps — 4.68 s and 3.94 s, arrival to arrival — against the game's visible spans. Those differ by the exit ramp plus the black hold, about 0.6 s, which is the whole of the discrepancy I was about to chase. This corpus has been bitten by exactly this before, in the plate delay: "timed from where build 4 stops animating, not from where it first appears — measured the other way the two runs differ by 0.48 s against 6 ms."

So the port paces the boot correctly, and rest.t is a wrong landmark whose blast radius is much smaller than I claimed: on the screens the sequencer actually advances off, rest.t plus the 24-unit exit ramp lands where the game lands. What it still affects is _script_settled, which waits longer than it needs to before photographing — a slow test, not a wrong frame.

dwell_seconds stays null, and the question is now closed rather than open

authored/timing.json says of it: "If a capture ever times the real boot, this is where that number goes." A capture has now timed the real boot, and the answer is that nothing goes there — the disc's own keyframe groups reproduce the game's dwells to 0.05 s and 0.01 s. The field stays null for a measured reason instead of an absence of one.

Taken from the same page, and not taken

• ✅ The 120-unit plate delay stands. The Decoder ran a refutation of it that failed instructively: its probe's title_static mark gave 3.203 s, which on a cold boot looks like a real effect. It was the instrument — the mark fires during the crossfade out of the attract movie, with the glyph count still 0. Re-measured from content: 2.247 s. The port changes nothing, and the declared 120 units is what it keeps.
• 🔴 No Ⓐ→menu dwell is authored. It measured 3.763 s and contains a 1.53 s guest load stall — the third independent reproduction of that stall, this one on a cold cache, so it is not a warm-cache artefact. It is emulator time, not a game constant.
• 🟡 Menu build-in 0.531 s and Ⓑ→title 0.482 s are not authored either, and that is the Decoder's own caveat rather than my caution: they rest on one run, where the plate delay and the load stall are each cross-checked against independent prior evidence. The port is within ~0.1 s of both with its existing 24-unit exit ramp, so authoring them would replace a disc-derived number with a provisional measured one and gain nothing measurable.

The voice presentation is now unambiguously the port's choice, and the recommendation behind it was withdrawn

The Decoder has withdrawn "highest byte rate": its sentence read "the highest-rate, highest-gain one is chunk 1", and those two criteria select different streams — ADV chunk 1 is 1 118 268 B at 0.0 dBFS, chunk 2 is 1 171 516 B at −8.3. The rule named one and the parenthetical named the other. I implemented the rule faithfully and got the quieter presentation.

What the file can still say is decoded and does not adjudicate it: the fmt chunk is a 32-byte XMAWAVEFORMAT whose +0x20 is a declared PsuedoBytesPerSec — 8 142 and 8 530 on ADV's two, matching the computed rates to 0.02 % — but wEncodeOptions (0x10d6), channel count and channel mask are byte-identical across the presentations. Nothing in the header ranks them.

⚠️ One more observable, measured here and not in that page: the two presentations differ in channel layout. ADV chunk 1 is mono-in-stereo — channel 2 digitally silent — while chunk 2 is dual-mono, both channels identical at −8.318574. So they are not two encodes of one file differing only in rate.

Also recorded, because it cost the Decoder time: sylpheed-cli audio info is not to be trusted on these. Its "16 channels / 4310 Hz / 2-bit" is wBitsPerSample, wEncodeOptions and the channel fields read at the wrong offsets — its XMA1 reader is misaligned. That is a tool in this repository reporting confident nonsense, and it is the second time a renderer or reader of ours has been believed before it was checked.

Refutation of my dual-mono inference — the measurement stands, the generalisation does not

I argued that highest_rate had no case because ADV's higher-rate presentation is dual-mono while its louder one is mono-in-stereo, so the extra bytes buy a duplicated channel rather than fidelity. The Decoder tested that disc-wide, as a refutation attempt, and it fails.

Over the 28 three-stream cues, the stream-3 / stream-2 size ratio runs:

min	median	max	sd	within 15 % of 1.0
0.0778	1.2565	2.9163	0.5057	12 of 28

Declared rates scatter with them — S06A is 5 661 against 16 513 B/s. A 37× spread is not a duplicated channel.

The channel measurement itself stands: ADV chunk 1 really is mono-in-stereo and chunk 2 really is dual-mono at −8.318574, and that is this port's own decode, which the Decoder could not re-run and did not dispute. What fails is the step from one asset to the format.

What this changes, and what it does not

Nothing in the export changes. loudest is a per-asset content rule — it reads the peak of the actual streams in front of it — so a scattering structural ratio cannot undermine it, and ADV's dialogue at +0.3 dBFS instead of −8.7 is plainly the better outcome either way.

What changes is the reason, in four places: authored/audio.json's presentation_why, the selector comment in audio.rs, BLOCKED.md's row, and this page. The honest statement is narrower and slightly less satisfying: highest_rate was never refuted — it was never argued for, and neither is loudest. Which is exactly why the entry is marked chosen rather than measured, and why one capture deletes it.

⚠️ This is the third claim of mine in two iterations that generalised a single-asset observation — after "the chunks are two stems" and "everything the sequencer paces off rest.t is late". All three were true of the thing I looked at. The pattern is not carelessness about the measurement; it is reaching for the rule the measurement would imply if it held everywhere, and writing that down in the same breath. The corpus catches it because someone else runs the census.

Two things in that data that are not mine, recorded so they are not lost

• S12B's three streams are byte-size identical (14 396 each).
• BIRD_224 is three-stream and is not a movie cue — so the three-stream shape is not exclusive to cutscenes, which narrows how it was described to this port earlier. Neither affects export_voice, which only resolves movies.

Two rows of the P1 baseline were comparing blank frames and reporting OK

docs/port/BLOCKED.md has carried a 🔴 since P3: "the loading screen's fade quad rests OPAQUE BLACK … it will bite whoever first draws a loading screen." It had already bitten, in the one place nobody looks — the regression harness.

build_12 and build_15 render as pure black in both renderers: mean 0, max 0, on the Godot side and on sylpheed-cli's. The difference between two blank frames is zero, so verify-screen scored them max 0 over3 0 OK — the strongest verdict it has. Two of sixteen rows were comparing nothing against nothing, and the committed baseline reads as sixteen passes.

That is worse than a missing test. A missing test is visible in the count.

The cause, isolated by a control rather than by reading

build_00 and build_01 are the plain loading variant — the same screen minus three elements. They render: mean 1.913, max 214.5. build_12/build_15 add pgloading_baseeff, pgloading_loop5 and pgloading_eff00, a 1280×720 primitive whose rest is 0xff000000 — opaque black — at t=38, inside its own opening black hold (0xff000000 at 38, 0xff000000 at 48, clear on the untimed final). It carries layer_source: "none", so paint order puts it last, over everything.

Same screen, one element different, one renders and one does not. That is the diagnosis, and it did not require an opinion about rest.

The rule I was about to write, and the census that killed it

The obvious reading is that rest.t = 38 is wrong because it precedes the element's last timed keyframe at 48 — so "rest.t before the last timed keyframe" would flag the pathology. I ran the census before writing the rule, and it does not survive: 152 of 212 elements in this export have rest.t earlier than their last timed keyframe. It is the norm.

What actually distinguishes this element is its content, and the reach of that is one:

screen	full-frame primitive	rest.t	last	rest fade
build_12 / build_15	pgloading_eff00	38	48	0xff000000
extras / extras_jp	pteff00	64	74	0x00000000
main_menu / main_menu_jp	pteff00	70	80	0x00000000
title / title_jp	pteff00	261	269	0x00000000
title / title_jp	pteff02	46	236	0x40000000

pgloading_eff00 is the only element in the whole export whose resting pose is a fully opaque full-frame quad — 1 of 212. Every other full-frame primitive rests clear or at 25 %. One instance is not a rule about rest, and keying the renderer on "an opaque full-frame quad at rest is probably wrong" would be a content heuristic of exactly the kind this port refuses elsewhere.

So nothing in the renderer changed, and the harness did

The screens stay black. Nothing draws a loading screen, and the honest position is that either rest is mis-identified for this one element — a decoding question, asked — or the screen really does begin fully black and --pose=rest is simply the wrong thing to photograph it at.

What changed is that a blank pair can no longer score. verify-screen now checks both frames for ink first and reports BLANK -- both renderers drew nothing; this row proves nothing. It is not a failure — the port may legitimately have nothing to draw — and status is untouched, so an unrelated DIFFERS still fails the run. The corrected baseline:

build_00/01        max 3    OK          press_start(_jp)   max 1    OK
title              max 6    DIFFERS     main_menu(_jp)     max 4    DIFFERS
extras(_jp)        max 3    OK          title_jp           max 155  DIFFERS
publisher_logo(_r) max 1    OK          developer_logos(_r) max 2   OK
build_12 / build_15                     BLANK  ← previously OK

Fourteen rows, not sixteen. No new drift among the fourteen.

Refutation attempt — the loading-screen variants, and it survived

The Decoder's ui-title-build-map.md says entries 0/1 are the plain loading variant at 7 elements and 12/15 the dressed one at 10, the three additions being pgloading_eff00, pgloading_loop5 and pgloading_baseeff. Checked against this export, which addresses by pak entry:

entry	elements
0, 1	7 — eff01 eff02 line loop1 loop3 loop4 str
12, 15	10 — the same seven plus baseeff, eff00, loop5

Exact, in both the count and the identity of the three. The claim survives, and it paid for itself immediately: the two variants differing by exactly the black quad is what made build_00 a control for build_12 and turned "the loading screen is black" into "this one element blacks it out".

🔴 The voice export is known incomplete — the game decodes all three streams at once

The Decoder booted with Canary's --xma_param_probe=true — the cvar whose own comment exists to say which sub-wave a movie's .slb the game decodes — and the answer is that it does not pick one. It decodes all three, concurrently, in three separate XMA contexts.

ctx	packets	byte_size	disc payload (RIFF − 60)
0	632	1 294 336	1 294 396
1	546	1 118 208	1 118 268
2	572	1 171 456	1 171 516

Three-way, byte-exact. So "three presentations of one take, pick one" is refuted by the running game, and the question I had been arguing about — which presentation — has no answer, because its premise was wrong.

This one was not caught by a census, and could not have been

The last three claims of mine that overreached were all killed by counting something. This one survived every count available: the streams really are equal-duration, one really is silence, one really is 0.60 × another with the residual 26.8 dB down. Every measurement was right and the frame around them was wrong, and no amount of looking harder at the file would have moved it — the file says ChannelMask = 0x0002 on all three. It took the running game.

That is the mission's own sentence arriving in practice: the Port has no oracle — if it needs to know what the game does, it asks. I did ask, repeatedly, and each time for the wrong thing: which stream, rather than whether the premise held.

What changed, and what deliberately did not

The behaviour is held. Reverting to the 1/n sum is not obviously less wrong: an equal-gain sum of channel pairs is not a downmix — MISSION §6 makes exactly that point when it pins an explicit matrix for the movies' 5.1 fold rather than letting ffmpeg default — and the sum cost S00A 6.02 dB when one stream was silence. Swapping one guess for another on the strength of a message is what produced this entry twice already.

What changed is that the wrongness is now loud. ⚠️ This failure sounds like success: a single stream decodes to clean, audible dialogue, so nothing a listener hears reveals that two streams are missing. So it is stated in three places a reader cannot miss — a top-level manifest.json warning per movie, the console line (1 of 3 streams -- KNOWN INCOMPLETE), and the entry's own why — and 🟡 became 🔴 in authored/audio.json and BLOCKED.md.

🟡 "They are 5.1" is the Decoder's hypothesis and is not established. Three concurrent stereo streams is six channels and N stereo streams is how XMA carries multichannel on the 360, which would explain the differing byte rates, the near-silent stream, and why cues are 1-stream or 3-stream and never 2. Against it: all three declare ChannelMask = 0x0002 identically, which is odd for distinct channel roles. Nothing here builds on it.

What settles it, and it is asked: a recording of the game's own output over ADV, through the PulseAudio null sink (AUDIO-VERIFICATION §3). Candidate combinations of the three decoded streams can then be correlated against what the game actually played — which turns the channel-role question from a decode into a fit against an oracle. Twenty seconds over dialogue is enough.

The measurements survive; only their meaning moved

S00A's silent stream and ADV's 0.60 × relationship are untouched and now read as facts about channels: 0.60 × with the residual 26.8 dB down is what a correlated channel pair at a lower level looks like, and a silent channel is an unused one. Nothing measured here is retracted. What is retracted is every sentence that called them presentations.

🔴 The oracle capture does not contain the intro — a controlled negative

The Decoder took the capture I asked for — adv-game-output-6ch.wav, 70.2 s, 6 ch, 48 kHz, shared as 1788018994-16f9d19d90b8, taken at 68aa192 — described as "the FULL mix, the movie's own WMA track plus the three XMA streams".

It contains none of them. Envelope cross-correlation, sliding with overhang, normalised over the overlap, minimum 30 s of overlap so a short window cannot win on an edge:

capture ch	against	best r	runner-up	margin
c0	ADV bed	0.361	0.359	+0.003	no match
c1	ADV bed	0.407	0.403	+0.004	no match
c0	voice stream 1 / 2 / 3	0.42 / 0.26 / 0.27	—	≤ +0.006	no match
c1	voice stream 1 / 2 / 3	0.47 / 0.34 / 0.34	—	≤ +0.006	no match
c0	BGM_103 (menu bed)	0.271	0.260	+0.011	no match
c0	S00A	0.351	0.349	+0.002	no match

The margin is the number that matters, not r. A match has a peak; these have a plateau — best and second-best differ by 0.001–0.016 across every pairing, which is what a statistic does when no alignment exists.

Three controls, because a negative from an uncontrolled instrument is worthless

1. The instrument finds matches on this data. bed vs bed → r = 1.000, margin +0.115. Voice stream 2 vs stream 3 → r = 1.000, margin +0.300.
2. My reference really is the movie. The .ogv transcode against the disc's own ADV.wmv → r = 1.000, margin +0.114. So a failure to match is not my transcode.
3. Time drift is ruled out. A stretched playback would break a long correlation while still matching locally, with the best lag climbing monotonically. Five-second windows of the capture slid over the whole bed give best lags of 4.95, 15.30, 119.35, 50.75, 29.35, 83.95 s — scattered across the movie, not monotonic, and every margin ≤ 0.017.

What I can say, and what I will not

Said: this capture cannot answer the channel-role question, and it is not the intro's audio. Not said: what it is. It is 70 s of something, all six channels carrying signal at RMS ≈ −27 dBFS, matching nothing this port exports. Diagnosing it is the Decoder's side of the wall and I have handed it back rather than guessing.

⚠️ One measurement on the file that may help them. Split as 5.1, channels 3 and 6 are byte-identical — same MD5, not merely the same peak and RMS to six decimals. An exact duplicate pair inside a six-channel "surround" output is consistent with the Decoder's own warning that the 6-channel frame is Xenia's hardcoded kFrameChannelsDefault, not the guest's request. It weakens, further, any reading of that file as evidence of a 5.1 game mix.

The voice export stays exactly as it is

Still one stream of three, still marked 🔴 in the manifest, the console line and authored/audio.json. The capture changed nothing, which is the correct outcome for a measurement that failed: the question is open, and it was open before. What would have been wrong is treating a 70 s recording as an oracle because it was expensive to obtain.

Resolved the same day — it was the capture path, and the duplicate pair was the thread

The Decoder found the cause and withdrew the capture: PulseAudio was remapping between two mismatched channel maps, and a 6-channel remap silently drops and duplicates. Its control needs no emulator and no disc — six channels, six different tones, the same sink and the same parec invocation — and came back 400 / 3200 / 200 / 800 / 800 / 200 for an input of 400 / 800 / 200 / 1600 / 3200 / 6400. Two source channels were gone entirely. Setting the sink's channel_map to the guest's own returns all six.

So the negative was right and, more usefully, the byte-identical pair I reported was the thread that unravelled it. That is worth recording precisely, because it was nearly not reported at all: it began as an idle check of two channels whose peak and RMS matched to six decimals, and the only reason it became evidence is that a coincidence at six decimals is cheaper to hash than to explain.

Withdrawn with the file, both the Decoder's: "all six channels carry signal", and the non-zero-surround observation offered as weak support for a 5.1 guest mix. Unaffected: the three-XMA-context concurrency result, which is read from the emulator's own log rather than the audio path, on two independent boots.

What the port took from it: tools/port/check-capture

A capture now has to pass a provenance check before anyone analyses it, and it is one command. It splits the file, hashes every channel and fails on any duplicate pair. Documented in docs/port/AUDIO-VERIFICATION.md §5.

Run through its own controls, both directions, because a checker nobody controlled is the thing this whole incident is about:

• six distinct tones → PASS;
• the remap's own output pattern → FAIL, naming all four duplicate pairs;
• the corrupt game capture → FAIL on ch2 == ch5.

⚠️ The known-bad control is the part worth reading. All six of its channels report a peak of −18.063656 dB — identical to six decimals — while containing three duplicate pairs. A level check cannot see this failure at all. That is why the tool hashes rather than measures, and it is why the corrupt capture's "plausible per-channel levels" were never evidence of anything.

The tool says so itself: it is necessary, not sufficient. Passing means no channel was duplicated; it says nothing about whether the right thing was recorded. A capture should survive both that and §1's correlation against a known source before anything is concluded from it — and the one that was analysed here would have failed the cheap check in thirty seconds.

The corrupt file is withdrawn from the exchange (share drop), so the next agent cannot pick it up and repeat the work.

🔴 Take 2 is clean, my instrument was not, and the negative had to be re-earned

The Decoder's second capture passes check-capture — I re-ran it myself rather than cite theirs — carries a screen log, and was recorded with the sink's channel_map set equal to Canary's own. It is a good file.

⚠️ One provenance discrepancy, minor but worth stating: the message gives 253.3 s; the file is 318.539 s. The screen log runs to 316 s and is consistent with the file, so this is a mis-stated number rather than a bad capture — but a length quoted in a provenance claim should match the artefact.

The retraction that came out of measuring it

Take 2 also showed no alignment with the bed or the voice streams. Before reporting a second negative I asked whether the method could do the job at all, by building a synthetic mix — the bed plus the three voice streams — and hunting the bed inside it.

It failed. r = 0.415, against the r > 0.8 bar my earlier negatives were judged against.

So the instrument that produced "the capture contains no ADV audio" could not have found ADV audio in a mix even when it was certainly there. That conclusion was right — the Decoder's tone control proved take 1 corrupt independently — but it was right by luck, and I reported it as measurement. The three controls I was pleased with tested the wrong things: that the method finds a clean signal in a clean reference, which was never the task.

The rebuilt instrument, calibrated in both directions

Band-limit so the target dominates, then judge on lag and margin, not on absolute r — the r > 0.8 bar is correct clean-against-clean and meaningless for a component in a mix.

hunting	band	against	r	lag	margin
the bed	40–180 Hz	mix containing it	0.663	0.0 s ✓	+0.111
the bed	40–180 Hz	voice-only mix	0.262	wrong ✗	+0.005
voice stream 2	300–3000 Hz	mix containing it	0.810	0.0 s ✓	+0.248
voice stream 2	300–3000 Hz	the bed alone	0.358	wrong ✗	+0.005

A 20–50× separation in the discriminating statistic. Documented as AUDIO-VERIFICATION.md §6.

And now the negative, supported

Every one of take 2's six channels, against both targets, sits in the known-absent regime:

	bed (40–180 Hz)	voice stream 2 (300–3000 Hz)
margins	+0.000 … +0.014	+0.001 … +0.017
lags	−58 … +255 s, scattered	−72 … +183 s, scattered

Take 2 contains neither the movie's WMA bed nor the cutscene voice, on an instrument that demonstrably finds both when they are present.

What that leaves, and it is not mine to answer

Two captures, differently configured, the second provably free of the channel-map fault, with a screen log saying the movie was on screen — and neither carries either audio source. That points away from a one-off setup error. The possibilities I can see are a capture path that still loses the guest's mix, or the guest not emitting these sources at all during the movie, and only one side of that wall can tell them apart. Handed back with the numbers.

⚠️ If it is the second, it reaches the port directly: the export's movie audio comes from the .wmv's WMA track, and if the game never plays that track, then ADV.ogv's audio is wrong in a way no amount of transcode fidelity would fix. I am not asserting that — it is a question about what the game does — but it is the reason this is worth another boot rather than being written off.

Every music bank was summed at 1/3 when only two sub-waves are music — 3.52 dB, since P6

The Decoder's message about BGM_102 came with declared durations from the corrected XMA1 PsuedoBytesPerSec, and checking my export against them turned up a defect of mine that had been shipping since P6.

export_bgm summed every sub-wave media returned and scaled by 1/n. Decoded and timed, the three banks are identical in shape:

bank	sub-wave 0	sub-wave 1	sub-wave 2
BGM_103	10 300 B → 0.009 s, peak −inf	3 876 924 B → 87.744 s	3 930 172 B → 87.744 s
BGM_102	10 300 B → 0.009 s, peak −inf	1 151 036 B → 37.482 s	1 269 820 B → 37.482 s
BGM_001	10 300 B → 0.009 s, peak −inf	4 466 748 B → 173.809 s	4 673 596 B → 173.809 s

Sub-wave 0 is digitally silent in all three, and 10 300 B is 10 240 + a 60-byte RIFF wrapper — 10 240 B being exactly what the Decoder's disc-wide census identifies as the bank header. So it is not a stem. Counting it in the divisor put every real stem at 1/3 instead of 1/2: 3.52 dB of attenuation on all the menu music this port has shipped since P6.

Dropping it is arithmetic, not a decoding decision — a silent input contributes nothing to a sum, and this is the same rule export_voice already applies. Measured after the fix: main_menu.ogg goes −7.69 → −4.20 dBFS, +3.49 dB against 3.52 predicted, the remainder being Vorbis.

⚠️ This is the third instance of one defect in this pipeline — a silent chunk in the voice sum, a silent channel in the mono fold, and now a silent sub-wave in the music sum. Each was invisible in every check except a level, and each time the divisor was computed from how many inputs there are rather than how many carry signal. That is the shape to look for, not the individual bug.

It also closes a 🔴 that has been open since P6

docs/port/BLOCKED.md carried "media::sound_bank_riffs returns three sub-waves where HANDOFF Q10's census says two" as a disagreement the port shipped deliberately. The census was right; the third was never a stem. The export now reports 2 sub-waves and the warning is gone — closed by measurement on my side, corroborating the Decoder's c1f3608 from a different direction (decoding it, rather than counting headers).

The declared-rate method, cross-checked a third time — and one correction

Their declared lengths against my decodes: BGM_103 87.750/87.749 vs 87.744; BGM_102 37.487 vs 37.482; BGM_001 173.821 vs 173.809. Agreement to 5–12 ms on three banks. The method is good for lengths.

🟢 Refutation attempt, and the conclusion survives while the reasoning does not. The Decoder wrote that BGM_001 reads "173.821 s declared against your decoded 167.663 s — a gap of 6.158 s", explaining it as "declared is the encoded stream, decoded is where the audio stops." A full decode of BGM_001 yields 173.809 s of PCM, not 167.663 s. The 167.663 figure is where the music fades out, measured from the audio; the stream then continues, silent, to its declared end. So declared and decoded agree to 12 ms and the trailing silence is inside the decode, not the difference between two methods. The cross-check stands — better than stated, since it is now three banks rather than a coincidence — and the sentence explaining it should go.

Take 2 was starved, my correlator was fine, and check-capture was incomplete

The Decoder diagnosed take 2: a starved capture. Verified here independently rather than taken on trust — 35.6 % of frames silent on all six channels, 10 482 alternating runs, median burst 13.5 ms and gap 3.9 ms, a 17.4 ms period at 57 Hz. Their untruncated original reads 39.3 % and 10 595 runs; the difference is exactly the truncation, and every other number agrees.

So my rebuilt correlator was working correctly on a file that could not carry the signal. ✅ And the alarming reading it produced — "the game may not play the .wmv's WMA track, so ADV.ogv's audio has been wrong since P4" — is not supported by this capture, and is not refuted either. It is withdrawn as a concern arising from evidence, and nothing is changed on account of it in either direction. That matters more than it looks: it was the most expensive-to-act-on hypothesis in the port, and it came from a file that could not speak to it.

The real deliverable: my own checker passed the starved file

check-capture tested only for duplicated channels, so it cleared a recording that was 36 % holes. A provenance check that passes the artefact it was built in response to is not a check.

It now measures starvation too. ⚠️ Two thresholds I invented were both wrong, and the controls caught both — which is the part worth recording:

1. Counting exact-zero frames. Real audio crosses zero constantly; a clean voice track scored 5 947 "gaps" of median 0.0 ms and was called starved. A gap is a run, not a sample. Only runs ≥ 1 ms count.
2. Gap count and median length. A genuine music bed shows 454 gaps at a median of 1.4 ms — quiet 16-bit passages really are zero for milliseconds — so neither statistic separates it from a starved file.

What separates them is the rate:

	gaps/s	median gap	all-channel silence
the starved capture	32.9	3.9 ms	35.6 %
a real music+SFX bed	3.3	1.4 ms	1.1 %
a voice track, 53 % pauses	0.03	—	—

Bar set at 20 gaps/s — 1.6× below the bad case, 6× above the worst good one, derived from the controls rather than chosen and then justified. Controlled in both directions: real stereo bed PASS, six distinct tones PASS, starved capture FAIL. It also now reports a data chunk declaring 0 bytes, which is what a file copied while still being written looks like.

🔴 The voice channel roles are not obtainable this session

Both capture routes are closed and the Decoder has said so plainly. The monitor sink is starved by construction — it advances at wall-clock rate and substitutes silence, so every moment the emulator runs slow is a hole, and deleting the holes warps the timebase rather than repairing it. The route that works is an internal tap at SDLAudioDriver::SubmitFrame, and that needs a Canary rebuild whose cost they have measured: the build root build-canary targets does not exist in that container, the warm tree is configured against the same missing path, so it is a full reconfigure and compile on a box with ~700 MB free and a history of parallel builds OOM-killing the host.

A whole session for one probe. That is a human's call and neither agent should start it mid-loop. Until then the port keeps authoring with the known recorded: one stream of three, 🔴 in the manifest, the console line and authored/audio.json.

The settle run carries an unmeasured real-time factor — and the numbers it touches were already unauthored

The Decoder has withdrawn one of the two arguments propping up its settle-time run. It had claimed the plate pulse period was an internal clock proving the run was not slowed; re-examined, that estimate rests on one interval at a 125 ms sample interval (±6.7 %), and re-running the trough-picking gives 2.628 s rather than the 2.369 quoted — an adjacent local minimum had been counted as a separate trough. Against the corpus's 2.24 s that is +17.3 %. It is too weak to show anything and cannot resolve a real-time factor below ~7 %.

✅ Nothing in the port moves, and this is the second time in two iterations that the right call was to have authored nothing.

number from that run	anchored by	did the port take it?
title → plate, 2.247 s	three prior readings (2.13 / 2.132 / 2.138) and the disc's declared 120 units	✅ it is what the port already draws
menu build-in, 0.531 s	nothing	❌ not authored
Ⓑ → title, 0.482 s	nothing	❌ not authored
Ⓐ → menu, 3.763 s	contains a 1.53 s load stall	❌ explicitly refused

Checked rather than remembered: grep over authored/ and port/scripts/ finds no 0.531 and no 0.482. The only build-in reference in the tree is the plate arithmetic — t=118 → t=238, 120 units — which is the anchored leg.

I declined those two because they were one-run figures the Decoder had itself flagged, and because the port was already within ~0.1 s of both from the disc's own keyframes. That reasoning has now been joined by a second, independent one I did not have at the time: a few per cent of slowdown sits inside them undetected. A provisional measurement adopted over a decoded number would have imported an error nobody could see.

verify-dwell — the comparison that refuted my own 🔴, made repeatable

Last iteration I measured the port's visible spans against the oracle's dwells by hand, and it refuted a red flag I had filed myself: rest.t is the wrong settle landmark, but "everything the sequencer paces off it is therefore late" was false, and I nearly went and re-paced screens that already matched.

That check existed once, in a transcript. It is now tools/port/verify-dwell.

screen               port         oracle (3 cold boots)      verdict
publisher wordmark   4.25 s       4.297 / 4.604 / 4.370      agrees
developer logos      3.75 s       3.508 / 3.503 / 3.366      agrees

⚠️ The trap it exists to prevent is in its header, because it is the whole point: a port's transition timestamps and the oracle's visible spans are not the same quantity — they differ by the exit ramp plus the black hold, about 0.6 s, which was the entire discrepancy I was about to chase. This corpus has been bitten by the identical confusion before, on the plate delay, where the two readings differ by 0.48 s against 6 ms.

The bar is the oracle's own run-to-run spread, plus one film interval. Three cold boots of the real game differ by 0.3 s; agreeing more tightly than the oracle agrees with itself would not mean anything, and a tighter bar would be a number chosen to look impressive. The developer-logo span read 3.50 s on the hand-run and 3.75 s here — one film interval apart, both inside the bar, which is the tool reporting its own resolution honestly rather than hiding it.

The oracle's numbers are quoted in the script as a test fixture and labelled as the oracle's, with the RE document they come from. Nothing in the port derives them and nothing may.

The PRESS Ⓐ plate pulses — authored per element, because the census forbids a rule

The human listed pulsation as first-class and the port drew nothing at all: the plate's focus record ptbtn00f was never reached, because press_start has no buttons and nothing is focused.

That it loops is measured, not assumed. The corpus timed the pulse four times — 2.12 / 2.19 / 2.34 / 2.31 s — and you cannot measure a period unless the thing repeats.

The rule I was going to write, and the census that forbade it

The spinning ring is a rule in the renderer (spin_period_units) and it earns that: 16 of 212 elements match its shape and all 16 are focus rings, zero false positives. So I looked for the analogous shape for a pulse — a group whose keyframes vary only in alpha, whose first and last alpha are equal, a closed cycle. ptbtn00f fits it exactly: 0 → 6 → 74 → 80 → 80 → 74 → 6 → 0.

Censused before writing it: 82 of 212 elements match. ptcopyright, palogo_sqex, ptmsg, ptlogo_back2, and every _eff fade-in-hold-fade-out on every screen. A renderer rule on that shape would make the copyright notice pulse.

Narrowing to focus records leaves exactly one distinct element (plus its JP twin). A rule justified by n = 1 is a special case wearing a rule's clothes. So the pulse is a lookup in authored/timing.json, keyed <screen>/<element>, and the census is recorded beside it so nobody widens it later.

The period is the element's own group — and the alternative is stated

129 units: its last timed keyframe is t=105, and the final untimed keyframe is reached exit_ramp_units (24) later. No new constant — 24 is the same authored value every other element's exit already uses. That is 2.150 s at 60 units/s, or 2.295 s at the ~28.1 fps the emulator presents, against measurements of 2.12–2.34 s. It sits inside the spread at either rate.

⚠️ It is a choice, and the alternative cannot be ruled out: the cycle could restart at the group's first keyframe (t=6) rather than at 0, giving 123 units = 2.050 / 2.189 s — also inside the measured spread. Nothing available separates them. t=0 is taken because it is where every other group in this port starts, which is consistency and not evidence, and authored/timing.json says so.

A fifth reading is recorded and not averaged in: the Decoder re-picked its troughs and got 2.628 s having previously reported 2.369 from the same run, then withdrew the estimate as too weak to resolve better than ~7 %.

Verified the way the ring was — bit-identity one period apart

20 authored periods is 2.15 × 20 = 43.00 s = exactly 172 film frames, so frames N and N+172 must be the same frame:

	max difference
f_055 vs f_227 (43.00 s)	0/255
f_060 vs f_232 (43.00 s)	1/255
f_070 vs f_242 (43.00 s)	1/255
f_079 vs f_251 (43.00 s)	0/255
control — f_070 vs f_243 (43.25 s)	58.7/255

The control is what makes the rest mean anything: a quarter-second off the period differs by 58.7, on the period by 0–1. Measured on the held boot title, where the glow-box mean swings 26.0 ↔ 37.7 — a real pulse, not a static glow.

✅ The oracle finally speaks: the exported voice IS the game's centre channel

The Decoder's fourth capture is the first faithful one — --gpu=null takes the guest from 0.70× to 0.96× real time so Xenia stops padding, an ALSA file tee in front of a paced slave removes PulseAudio's wall clock entirely. 59.7 s, 0.35 % silence, one gap in the whole file, six distinct channel hashes. Checked here independently: it passes check-capture, and its header sizes verify exactly (RIFF 34 369 572 / data 34 369 536 against 34 369 580 actual).

The correlator was already calibrated, so the fit was a re-run rather than a rebuild. Controls first, on this instrument: known-present margin +0.248, known-absent +0.005.

Speech band, 300–3000 Hz

	FL	FR	FC	LFE	RL	RR
stream 1 (leading)	+0.013	+0.006	+0.012	+0.009	+0.012	+0.005
stream 2 — the one exported	+0.238	+0.171	+0.305	+0.011	+0.035	+0.006
stream 3	+0.240	+0.173	+0.307	+0.009	+0.054	+0.006

r = 0.989 on FC, margin +0.305 — above the known-present control. And the bed, in the low band, is the mirror image: FL 0.763 / FR 0.838 / RL 0.805 / RR 0.817, all agreeing on the same lag, and FC 0.317.

What is established, and what is not

✅ The capture contains ADV's audio, at lag ≈ +6.6–6.7 s — agreed by two independent bands and by six channels.

✅ The dialogue is in the centre channel and the bed is in the four corners. FC carries the voice and not the bed; FL/FR/RL/RR carry the bed and not the voice. That is a textbook film mix, and it is measured rather than inferred from a header — which matters, because the header says ChannelMask = 0x0002 on all three streams and would never have told us.

✅ The port's exported voice file is the material the game plays in FC. The loudest choice in authored/audio.json — which I recorded as an unjustified choice — selects the dialogue. A mono voice file played into the mix is the right approximation of a centre channel.

⚠️ Streams 2 and 3 are indistinguishable to this instrument, and that is expected: I measured months-of-iterations ago that stream 3 is 0.60 × stream 2 with the residual 26.8 dB down. They are the same take at two levels, so they correlate identically with everything. This does not say loudest picked the right one of the two — only that whichever it picked is the dialogue.

⚠️ Stream 1 is not detectable in this window, margins +0.005…+0.013. Consistent with it being the tail of stream 2 (measured earlier at r = 0.998) and with a 59.7 s window that starts before the tail.

🔴 The 1 of 3 streams warning stays. Nothing here explains what the other two contribute to the game's output, and the export still ships one. What changed is its character: it is no longer "one of three, contents unknown" but "the centre-channel dialogue, plus two streams whose relationship to it is measured and whose role is not."

⚠️ And the reach: 59.7 s of a 137 s movie, one run, at 0.96× real time. The --gpu=null route costs video, so this capture has no screen provenance — its provenance is the XMA probe showing ADV's three streams decoding during the run, which for an audio question evidences the thing recorded rather than what was on screen.

The stripping control passes — S00A is obtainable, and the gate is cleared

The Decoder made this the gate on S00A, and it is the right call: ADV plays itself on boot so it can be captured with --gpu=null at 0.96× real time, but S00A starts ~4.5 s after Ⓐ on a save slot, which needs a driven run, which needs screens, which rules out --gpu=null. So S00A is necessarily the 0.70× rendered route with ~10 % additive padding — and is only worth a boot if stripping that padding is exact.

It is. A real music+SFX bed (137.37 s, carrying 454 genuine zero runs of its own) had 1 149 holes inserted at 8.37/s to +9.9 % length, matching the observed ALSA profile, then was stripped and correlated in the low band:

	r	lag	margin
original vs itself — ceiling	1.000	0.0 s	+0.141
padded vs original — what padding costs	0.436	−12.2 s	+0.006
stripped vs original — recovered	1.000	0.0 s	+0.142
stripped vs original-also-stripped	1.000	0.0 s	+0.143

Two things worth reading off that table.

First, padding at that profile destroys correlation completely — r 0.436, margin +0.006, which is the known-absent regime. That independently confirms, on a file whose contents I control, that the earlier captures were unusable for the reason claimed rather than for some other reason.

Second, recovery does not require stripping both sides. The stripped capture matches the unstripped source at the ceiling. That matters operationally: the port's reference assets never need touching.

⚠️ What the control does not license. Stripping removes genuine silence too and cannot tell the two apart. On this material the genuine runs total 0.71 s in 137 s and cost nothing measurable; on material that is mostly silence they would. And the whole thing rests on the substituted-versus-additive distinction — it is valid for Xenia's ALSA padding, which inserts, and it is vandalism on a PulseAudio monitor capture, which substitutes. tools/port/strip-padding says so in its header before it says anything else, because running it on the wrong artefact would look like it worked.

Its output is byte-identical to the control's own stripping, so the tool and the experiment are the same operation rather than two implementations that agree.

The correctness harness the docs promised for eight milestones did not exist

tools/port/verify-screen, line 20, since P1: "Use tools/verify-capture for the correctness question." There was no such file. The port has had a harness comparing itself to sylpheed-cli — two renderers sharing its assumptions — and none comparing it to the game, while its own documentation said otherwise.

docs/re/captures/ORACLE-CAPTURES.md is blunt about why that matters: two renderers agreeing proves nothing, and this corpus has been bitten three times — the dropped pteff05 background, the scale-0 rect, rest() — each invisible to a render-vs-render diff and obvious against a capture.

tools/port/verify-capture now exists. Five screens, against framebuffer captures of the real game:

screen	RMSE	differing	note
main_menu	14.79	0.25 %	focus state may differ
extras	15.29	0.46 %	focus state may differ
title	21.07	1.82 %	ptloop sweeps never stop
publisher_logo	10.77	1.00 %
developer_logos	9.37	0.39 %

No screen shows a large connected blob — the shape a missing or misplaced element makes, and the shape all three historical failures made. The differences are scattered, and the two largest have stated causes.

74 % of main_menu's difference is the oracle's own focus signature

The corpus ships live-main-menu.png and live-main-menu-options-focused.png — the same screen with a different button lit. Their difference is what focus changes, measured by the oracle against itself. Of the port's 2 159 differing pixels, 1 599 — 74.1 % — fall inside that signature. So the bulk of the disagreement is a state mismatch (the port focuses NEW GAME, authored, because HANDOFF Q5 measured initial focus as unstable), not a rendering defect.

Refutation attempt — the tone curve survives in its stated reach and not past it

ui-render-tone-curve.md models the relationship as capture = 255·(render/255)^γ, γ ≈ 1.34–1.49, measured on dark flat patches (render ~0–60), with "nothing constrains midtones or highlights" written into its own reach.

I tried to fit that γ and got contradictory answers three times, and the contradictions were mine. Binning every structurally matched pixel of main_menu by render level gives the relationship directly:

render	capture	implied γ	pixels
8	4.04	1.20	183 026
16	7.89	1.26	227 630
24	15.57	1.18	100 945
32	26.15	1.10	87 474
40	38.07	1.03	86 094
48	53.96	0.93	85 255
64	78.52	0.85	6 509
96	130.44	0.69	1 682

✅ The claim survives where it was measured. In the darks the capture really is darker than the render and γ > 1.

🔴 It is not a single power law. The implied exponent falls monotonically and crosses 1.0 near render ≈ 44 — above that the capture is brighter. One exponent cannot express a curve that crosses unity, which is precisely why my whole-frame fits kept returning γ = 1.00: the darks want more than 1 and the midtones want less, and they cancel.

So the corpus's stated reach was not a hedge, it was the finding. ⚠️ And the exponent in the darks measures 1.18–1.26 here against the page's 1.49 for this screen — a disagreement I am recording rather than resolving, since they fit selected flat patches and I binned every matched pixel.

The tool reports the curve, not a best exponent

Two earlier versions of verify-capture reported a best-fit γ and were wrong both times — once by fitting across a 74 % structural mismatch, once by extrapolating past a reach the measurement's own authors had written down. Extrapolating a measurement past its stated reach is how this tool got it wrong twice, and the answer was not a better fit but a different instrument: a table somebody can argue with.

Identifying the capture's focused button — and my harness was posing the port wrong

The Decoder attached an honest caveat to its reproduction of the tone-curve refutation: its bins included the focus-state mismatch, so it was "not a clean second opinion". That is removable, and removing it found a defect of mine.

The method, with a known-answer control

--menu=main_menu --script=down,down,down,down walks focus through all five buttons and shoots each. Compare every one against a capture; the minimum identifies the focused button. The control is the capture whose answer is in its own filename:

render focus	vs live-main-menu-options-focused	vs live-main-menu
ptbtn01 NEW GAME	6 351	531
ptbtn02 LOAD GAME	7 087	7 094
ptbtn03 TUTORIAL	6 230	6 237
ptbtn04 OPTIONS	1 292	6 364
ptbtn05 EXTRAS	6 073	6 080

✅ The control picks OPTIONS, by 4.7× — the answer the filename gives. ✅ So the test is trustworthy, and live-main-menu.png has NEW GAME focused, by 11.5×.

Which is what the port already focuses. authored/flow.json's initial_focus: ptbtn01 was chosen because HANDOFF Q5 measured focus as unstable across boots — four boots gave TUTORIAL, TUTORIAL, NEW GAME, NEW GAME — and it is one of the two observed states. It is now also the state of the committed capture. ⚠️ That is corroboration, not a decode: Q5's instability stands, and this identifies one frame rather than a rule.

The defect: verify-capture rendered menus with no focus at all

--screen= draws no focus record, so the harness had been comparing main_menu to the oracle in a state the oracle was never in. Rendered properly, with --menu=:

	before	after
main_menu	0.25 % differing, RMSE 14.79	0.06 %, RMSE 13.21
extras	0.46 %, RMSE 15.29	0.20 %, RMSE 13.38

A 4× improvement on main_menu that was entirely my harness posing the port wrong, not the port drawing wrong. Worth stating plainly: the first run of a new correctness harness reported a discrepancy, and three quarters of it was the harness.

And the Decoder's caveat resolves to nothing — measured, not assumed

Re-deriving the transfer curve on the correctly-posed pair gives 1.20 / 1.26 / 1.18 / 1.10 / 1.03 / 0.94 at render 8…48 — unchanged from the mismatched run. So the focus-state contamination it flagged really did not move the trend. Its reproduction stands as a second opinion after all, and that is now a measurement rather than a hope.

tools/port/which-focus — the Decoder asked for a detector, and it carries its own control

S00A is blocked on knowing which button a screenshot has focused. newgame_path.sh assumed NEW GAME is focused at boot, drove on that assumption, and landed in a tutorial mission — because HANDOFF Q5 measured focus as unstable across boots. And counting presses cannot substitute: ⬆ from the first item wraps to the last, so no fixed number of presses lands on a known item from an unknown start.

The Decoder's own attempt — a per-row brightness statistic — failed the control, picking NEW GAME on the capture whose filename says OPTIONS. The render-difference method passes it, so it is now a script that agent can run.

It runs the control on every invocation, not once when it was written

control -- live-main-menu-options-focused.png (answer is in the filename):
    OPTIONS      1285      <- picked
    EXTRAS       6073
    ...
  -> OPTIONS, margin 4.7x     CONTROL PASSED

If that fails, the tool refuses to report a result at all. A control that does not execute is not a control, and this one cannot be skipped.

Three checks, and one of them independently reproduces a corpus measurement

input	verdict	margin
live-main-menu-options-focused — known answer	OPTIONS	4.7×
live-main-menu — the question	NEW GAME	11.4×
live-extras — known from the corpus	MISSION SELECT	4.2×
live-title-press-a — no menu at all	refuses	1.0×

The extras row is a second known answer I did not plant: authored/flow.json already records "MEASURED: EXTRAS opens focused on MISSION SELECT (live-extras.png)", and the tool reaches it independently.

The title row is the negative control. A frame with no menu in it gives a margin of 1.0× and the tool says "this frame does not decide it. Do not act on this."

⚠️ And that refusal now carries a non-zero exit code. The first version printed the warning and exited 0 — so a caller scripting it, which is the entire point, would have read a refusal as an answer. That is the same defect as a checker claiming a check it skipped, and it is the fifth instance of that shape between the two of us this session.

What it is not: it identifies focus in one frame. It says nothing about what selects focus; Q5's instability stands.

The title's 1.82 % — three of my own explanations refuted, and the format has no blend mode

title is the port's largest disagreement with the oracle, and last iteration I attributed it to the moving ptloop sweeps without checking. That attribution is wrong, and so were the two hypotheses I formed after it.

❌ Not the sweeps. ptloop01/ptloop02 are 399×180 at (441, 270) — small and central — and their exported keyframes hold pos, scale and rotation constant, varying only alpha. The difference peaks at x ≈ 1088, nowhere near them.

❌ Not an over-held element. --screen holds every element at its own rest.t, so I added --no-hold to render the other answer. Playing the title's groups past their rest fades the whole screen to black by t = 5.2 s — 30.97 % differing against 1.82 % held. Holding at rest is right.

❌ Not a timing offset. Sweeping the build-in: 24.05 % at t=1.6, falling monotonically to 1.68 % at t=4.18 and 1.82 % settled. The capture is at the settled end; there is no earlier moment that fits better than marginally.

What it actually looks like: a horizontal redistribution

Signed difference (port − capture), by cell:

	x=0	x=320	x=640	x=960
y=0	+1.1	−13.1	−6.6	+16.0
y=169	+2.1	−8.3	+4.2	+9.9
y=338	+5.8	−4.5	−0.0	+3.2
y=507	+3.9	+3.3	+2.0	+2.3

The port is darker centre-left and brighter right, and it nearly cancels — whole-frame means 63.8 against 62.5. That is not a level error and not a tone ramp; it is brightness in the wrong place. And it falls in exactly the rows spanned by the two wide elements ptlogo_back2 (1118×262 at 71,126) and ptlogo_back2eff (1133×280 at 64,117), with the column profile falling off past x≈1152 against their right edges at 1189 and 1197.

🔴 The export carries no blend mode, so the port cannot draw one

ptlogo_back2eff's exported keys are declared, id, index, keyframes, kind_raw, layer, layer_source, pivot, rest, role, sprite. There is no blend field, in this element or in FORMAT.md at all. The port composites everything with normal alpha.

If the game draws _eff layers additively, a wide gradient sprite would produce precisely this signature — surplus where the sprite is bright, deficit where the underlying art is brighter than the sum — and nothing in the export would reveal it. That is a decoding question, not a port one, and it is asked rather than assumed. ⚠️ It is a hypothesis I have not tested; I am recording it because the three I could test are dead.

A separate rest.t casualty, recorded and not acted on

pteff02 is a full-frame primitive whose group runs 0x40000000 (25 % black) at t=46 → 0xd4000000 at 76 → 0xcc000000 at 118 → 0x00000000 at 236. Its rest.t is 46, so the port holds a 25 % black veil the screen's own timeline removes. This is the third instance of rest.t naming a hold that is not the settled state — after the loading screen's opaque quad and ptlogo1's creep. ⚠️ It does not explain the residual — removing a darkening veil would make the port brighter still, and it is already brighter where it disagrees — so it is recorded rather than fixed.

And a new diagnostic

--no-hold plays a screen past its rest instead of clamping each element at rest.t. Added because the question "is the held pose what the idle game shows" could not be asked otherwise. ⚠️ Its first version set the flag thirty lines before view exists and silently rendered nothing — caught because the comparison loop found no files, not because anything reported an error.

🔴 The exporter dropped nested .rat leaf geometry on 45 elements — and it is the title's 1.82 %

The Decoder overturned one of my three eliminations, and it was the one I was most confident about. I ruled out the ptloop sweeps because "399×180 at (441, 270), keyframes hold position constant" — that is the parent's record. The geometry is in the leaf, and the exporter never opened it.

	parent (what the export shipped)	leaf ptloopNN.rat
ptloop01	scale (100, 100), rot 0, pos (441, 270) fixed	scale (100, 600), rot +30°, x sweeping −639 → −39 → 1521
ptloop02	scale (100, 100), rot 0, pos (441, 270) fixed	scale (100, 800), rot −45°, x sweeping 1721 → 1111 → −839

Two ~1080 and ~1440 px quads leaning opposite ways and sweeping across the frame, against two 400 px sprites drawn upright and static in the middle. That is exactly the signature I measured — darker centre-left, brighter right, nearly cancelling — and the Decoder's GPU capture puts their centres at x ≈ 467 and 992, which are the two cells where my signed difference peaked.

ui_layout's own doc comment had said so: "the rotated quads come from its two nested .rat leaf records, which the census never opened." Neither did this exporter. It opened a leaf in exactly one place — highlight_name, for focus records — and nowhere else.

It is not two elements. It is 45

screen	elements with a dropped leaf
main_menu, extras, press_start (+ JP twins)	every button — ptbtn01.rat … ptbtn13.rat, ptbtn00.rat
title, extras	ptloop01.rat, ptloop02.rat
build_00/01/12/15	pgloading_loop1/3/4/5.rat
title_jp	ptlogo_eff2.rat — two elements

⚠️ The buttons are the benign case and screen.rs already knew it: "a BASE record's leaf duplicates the parent's placement and the two can differ by a unit (ptbtn04: parent y=401, leaf y=402). There the parent wins." The ptloop case is the opposite — the parent carries no geometry at all and the leaf carries all of it. 🟡 And title_jp's ptlogo_eff2 is the element DECISIONS has recorded since P1 as the single largest render disagreement in the export, "the one drawn element at a scale that is not a whole multiple of 100 %". It has a two-element leaf. That is a lead, not a conclusion.

Emitted, deliberately not drawn

Element::leaf now ships the decoded leaf, and one read_leaf closure serves both it and the focus path — a second copy is how the case would go missing again.

🔴 ScreenView ignores it, and that is the honest state. Parent and leaf each carry their own alpha ramp on a different span — parent 0 → 255 over t=70…238, leaf 255 → 0x80 → 255 over t=150…600 — so how the two compose is a decoding question, and drawing the leaf on a guess would replace a visible 1.82 % gap with an invisible wrong one. verify-screen confirms nothing moved: title still max 6 / over3 790, main_menu max 4, title_jp max 155.

✅ Additive blending is refuted — the Decoder tested T8aD +0x04 bit 0x02 as an additive selector and "every measure worsens". My blend-mode hypothesis from last iteration is dead, and the export carries no blend field because none has been found: the per-draw capture records primitive type, index count, shader hashes, texture bindings and vertex attribute 0, and no RB_BLENDCONTROL.

🔵 And this makes the port's biggest oracle gap the same item as the rotation question already standing with the human. sylpheed-cli screen render deliberately does not rotate, which is why both renderers show it — the Decoder measures its own residual as tiles running −38.6 then +33.8 and cancelling, the same shape as mine. It is a shared decode gap, not a defect in my compositor, and MISSION's "Needs a human decision — rotation" now has a number attached: 1.82 % of the title's pixels, in a signature that can be recognised.

The leaf composition is decoded and implemented — and it does not close the 1.82 %

The Decoder decoded the rule I refused to guess: draw the leaf on its own timeline; do not multiply the parent's alpha in. Multiplying is refuted, not merely unsupported — at the fitted time the parent has expired (its group returns to 0 at t=250 and holds), so leaf × parent / 255 predicts zero for both quads and the sweeps would be invisible. They are drawn.

The fit is worth repeating because of its shape: the game's own composed alpha is observable in the per-draw vertex colours (C3FFFFFF/B6FFFFFF = 195 and 182), fitting only those two numbers against the two leaf ramps gives one consistent time t = 355, and the same t then predicts quad centres at 981 and 478 against 992.0 and 467.2 measured. No x entered the fit.

Implemented: _draw_leaf runs the leaf unclamped — like the spinning ring, and for the same reason. Held at its own rest.t the leaf sits at x = 1521, entirely off the right edge, so holding would delete the sweeps rather than settle them.

🔴 And it changes nothing measurable. The title is still 1.82 %

t	units	differing
4.35 s	261	1.82 %
5.917 s	355	1.81 %
7.00 s	420	1.79 %

At t=355 my interpolation puts the leaf's top-left at x ≈ −324 — off-screen left — where the Decoder's model puts the quad's centre at 981. Those cannot both be right, and the gap is not something to tune away: it is a disagreement about how the leaf's keyframes become a placed quad, most likely in the pivot and the rotation about it. Handed back with both numbers.

So the honest state: the exporter no longer drops the data, the composition rule is implemented as decoded, and the port's largest oracle gap is exactly where it was. Fixing the export was necessary and was not sufficient.

Two flagged elements deliberately not drawn

authored/rendering.json narrows drawing to ptloop01/ptloop02 — what the decode covers — while the exporter keeps flagging all 15.

• title_jp/ptlogo_eff2 — parent 125 % at (412,96), leaf 100 % at (402,66). The same shape, and the element DECISIONS has recorded since P1 as the largest render disagreement in the export. The Decoder said plainly "I have not tested it." Drawing it would extend a decode past the case it was fitted on — the failure this port has made four times this session.
• pgloading_loop5 — leaf scale (0, 0). A zero scale is one of the three historical failures this corpus names, so it is exactly where a guess costs most.

⚠️ And neither can be adjudicated here. title_jp has no oracle capture, and verify-screen compares against sylpheed-cli, which draws no leaves at all — so any leaf drawing increases that divergence whether it is right or wrong. Its max went 155 → 232 when they were drawn, and that number is not evidence in either direction. Recognising it as uninformative is the reason it did not become a justification.

The −324 was the old keyframe association, and the corrected one is available today

The Decoder found it and it is not geometry: my leaf path pairs each pose with the next pose's time. Fed my pairing into its own interpolation, it reproduces −324 to the digit. Corrected, t=355 gives top-left 781 and centre 980.5 against 992.0 measured — so there was never a 1 300 px pivot mystery to look for, and I am glad I said the two numbers instead of hunting one.

🔴 Correcting BLOCKED: this was never gated on a branch landing

docs/port/BLOCKED.md has carried the keyframe-record-layout row as "NOT taken, and it cannot be taken yet … sylpheed-formats is a path dependency, so this reaches the port only when that branch lands on main."

That is wrong. The corrected association is in this checkout, behind an environment variable:

// Set `SYLPHEED_KF_TIME_SHIFT=1` to read `W[k-1]` as block `k`'s time
// ("the word is the time the NEXT pose is reached") instead of `W[k]`.

It has been switchable the whole time. I read that file twice this session — once for rotation_deg, once for the leaf note — and did not notice the switch.

The experiment, run: mixed, and not decisive for the reason that matters

Re-exported with SYLPHEED_KF_TIME_SHIFT=1 and asked the oracle:

screen	default	shifted
main_menu	13.21 / 0.06 %	13.81 / 0.10 % — worse
extras	13.38 / 0.20 %	13.95 / 0.24 % — worse
title	21.07 / 1.82 %	20.41 / 1.86 % — RMSE better, area worse
publisher_logo	10.77 / 1.00 %	9.05 / 0.75 % — better
developer_logos	9.37 / 0.39 %	8.86 / 0.33 % — better

⚠️ And it does not adjudicate the association, because the port's renderer is built for the other one. Under the shift the untimed keyframe moves from last to first — the leaf reads t=None at x=−639, then t=150, t=540 — while pose_at is written around "the final keyframe carries no t, so it is given a synthetic time exit_ramp_units after the last timed frame." So this measures a renderer/association mismatch, not the association. BLOCKED said as much: the change touches pose_at, settle_units, spin_period_units, exit_ramp_units and the plate.

Export reverted to the default. Adopting the shift is a real piece of work — re-deriving the exit ramp, the settle, the spin period and the plate against a layout where the untimed frame is the first — and doing it hastily at the end of an iteration is how a 1.8 % gap becomes five wrong ones.

⚠️ The methodological point, which is the Decoder's and is the best thing here

Its rule matched because alpha at t=355 sits inside a long segment where a one-keyframe shift barely moves it, while x sweeps 1 560 px over the same span. It confirmed on the insensitive quantity; I was wrong on the sensitive one; and neither of us saw it until the two were compared.

Check a new interpretation against the fastest-moving field you have, not the one that happens to agree.

That is a different failure from the ones this session has collected — not an uncontrolled instrument, but a control chosen where it could not fail.

❔ A residual 11.5 px (980.5 against 992.0) is left over and is not to be fitted. A rotation about a declared pivot rather than the centre would displace by roughly that; if it still matters once the association is adopted, it gets measured rather than derived.

Re-running the P5/P6 gate after eight iterations of changes

The leaf path, the plate pulse, the BGM level, the voice export, the focus fix and a new diagnostic flag have all landed since the gate was last actually run. The mission's test is "a human presses a d-pad and Ⓐ and moves through those screens", and I had been verifying pieces of that against captures without once re-running the whole walk.

It works. Nine steps, unattended:

step
⬇ ×4	ptbtn01 → ptbtn05	focus moves, every frame drawn
Ⓐ	EXTRAS → screen extras, focus ptbtn11
Ⓑ	back to main_menu, focus restored to ptbtn05	HANDOFF Q5's rule, live
⬆, Ⓐ	ptbtn04 OPTIONS, destination outside this archive	prints the gap rather than pretending

Filmstrip shared as 1788027380-788b1faafc3e. Every shot is non-blank (frame means 31.5–33.1).

The sound is verified by a null control, not by a detector

I first tried an onset detector: count sharp level rises in the recording. It found one onset in the walk — and the same one in the music bed alone, which contains no cues. The 50 ms envelope cannot see a short cue over the bed. ⚠️ The right response to a detector that cannot separate its control from its subject is to stop using it, not to widen the window until the numbers look better. That is the shape this session has hit five times.

So the same technique that settled the voice: shadow the three cues with silence through data/mods/, run the identical walk, and compare.

	peak	RMS
walk, cues playing	+0.0003 dBFS	−18.36
walk, cues silenced	−4.74 dBFS	−20.78

Silencing three sound effects costs 4.74 dB of peak and 2.43 dB of RMS, and the walk's peak is set by a cue rather than by the music. The mod log confirms exactly three files shadowed. No detector, no threshold, and the control is the same run with one input changed.

⚠️ Recorded under the Dummy driver, as everything audio here is. It shows the cues reach the Master bus at the right moments; it does not show they are the cues the game plays — that is HANDOFF Q8, and authored/audio.json still carries the offsets as measured rather than decoded.

Pinned formats-pin-2026-08-29c — and the knob I tested last iteration was retired

🔴 I tested the wrong switch. SYLPHEED_KF_TIME_SHIFT is a superseded partial fix: it got the association right but left pose 0 untimed, which is exactly why the untimed keyframe appeared to "move from last to first". It does not exist in the current parser. The real correction is the default in the tagged crate, with the old reading behind SYLPHEED_KF_TIME_LEGACY=1 — the opposite polarity from what I had.

So last iteration's five rows measured a renderer/association mismatch against a knob nobody should use. I suspected they were not decisive; I did not suspect the knob itself was retired.

The consequence is smaller than I budgeted for: there is no untimed keyframe

A placement group is an 8-byte header then frames × {u32 time; 36-byte pose}, so pose 0's time is the group's lead-in word and every pose is timed, including the last. Measured on the re-export: 866 keyframes, 0 untimed.

pose_at's premise — "the final keyframe carries no t, so it is given a synthetic time exit_ramp_units after the last timed frame" — does not invert, it disappears. The branch is now dead code rather than wrong code, which is why nothing needed re-deriving to adopt this.

And the leaf reads as the Decoder's table says: t=0 x=−639, t=150 x=−39, t=540 x=1521. At t=355 that interpolates to x = 781 — the top-left it predicted, and the 1 300 px discrepancy is gone.

Pinned by tag, which is what MISSION §2 is for

"The RE agent tags when it lands something you need and tells you over the message channel — that is how you stay current without floating."

That is precisely what happened, so crates/sylpheed-export/Cargo.toml now pins formats-pin-2026-08-29c by tag. ⚠️ BLOCKED.md was wrong in both directions — it said the change "cannot be taken yet" and that it arrives only when the branch lands on main. It arrives when the tag is pinned.

🔴 The cost, stated rather than discovered later: sylpheed-cli builds from the workspace crate, so until this reaches main the exporter and the reference renderer read different decoders, and verify-screen is comparing two eras rather than detecting drift. verify-capture is unaffected — it compares the port against oracle captures and never touches the CLI — and it is the check that matters. Revert to the path dependency the day the tag is an ancestor of main.

What the oracle says

screen	before	after
publisher_logo	1.00 %	0.75 %
developer_logos	0.39 %	0.33 %
extras	0.20 %, region 736×525	0.19 %, region 398×295 at (441,230)
main_menu	0.06 %	0.06 %
title	1.82 %	1.82 %

The splashes improve outright. ⚠️ extras is the interesting row: the area barely moved but its differing region collapsed onto the sweep position (441, 270) — the residual is now localised to the one element still in question rather than spread over the screen.

The title does not move. Its row is now posed at t=355, the Decoder's fitted sweep time, because the leaf group ends at t=600 with the quads parked off-screen at x=1521 — posing at the settle simply omits them. ⚠️ t=355 is not the time that minimises the difference: t=390 measures 1.65 %. Picking that would be fitting the pose to the score, which is what this harness exists not to do.

Refuted — my own "the single non-whole-multiple scale in the export"

DECISIONS has said since P1 that ptlogo_eff2 is "the single drawn element in the whole export at a scale that is not a whole multiple of 100 % (125 %)". That census was parents-only. Opening the 45 leaves finds thirteen distinct non-whole-multiple scales — 75, 96, 99, 101, 103, 112, 125, 150, 204×208, 210×220, 250 — and 125 % is among the rarest at two occurrences. ptlogo1/ptlogo2 carry 101/103/112 on the English title.

The claim's real content was "the only one the port draws" — a fact about my element set, not about the disc. Corrected.

🔴 And ptlogo_eff2 stays withheld, now for a stronger reason than caution. Its 125 % is a pop, not a steady scale: scale-0 → 125 % → scale-0 between t=50 and t=107, ≈0.95 s. The leaf draws at 100 %, as two superimposed copies at alpha 160 and 80, each rotating 360° over 960 units — 16 s per revolution. If parent scale gates the leaf it is a 0.95 s flash; if the leaf runs free it spins for 16 s. Nothing on the disc chooses, title_jp has no oracle capture, and the Japanese-locale capture MISSION has parked is what would settle it.

The 11.5 px was the fit's resolution, and the lesson inverts

The Decoder closed it by adding observables, not by tuning — the vertex buffer carries positions and colours at the same instant, so all four quantities must agree on one t:

observable	solved t	precision
quad A x	357.88	±0.12 units
quad B x	357.58	±0.12 units
quad A alpha	355.75	±1.54 units
quad B alpha	354.09	±1.89 units

Alpha moves only 0.27–0.33 levels per keyframe unit, so one byte of quantisation is worth 1.5–1.9 units, which at 4 px/unit is 6–8 px of sweep. That is the whole of the 11.5 px. At t = 357.7 the centres land within 0.70 px and both alphas inside one level.

⚠️ The lesson is the earlier one inverted, and this is the half worth keeping. Checking a wrong rule against alpha made it look confirmed. Here the same insensitivity manufactured a residual that did not exist. So an insensitive quantity does not merely fail to falsify — it invents error. Solve on the fastest-moving field; check the slow one; never the reverse.

I was already looking for a pivot rule to explain 11.5 px when they wrote. There was nothing to find.

Refutation attempt — the pivot claim, checked here and survived with a nuance

They state the leaf pivot is (200, 90) on a 399×180 sprite, "the pivot is the centre, so rotation displaces it by nothing." Checked against my own export: pivot [200, 90], sprite 399×180, true centre 199.5, 90.

✅ Survives. ⚠️ With one correction of no consequence: the sprite is odd-width, so the pivot is the centre to within half a pixel, not exactly. Against their −0.70/−0.48 px agreement that changes nothing, and it is worth stating only because "displaces it by nothing" is the kind of sentence that later gets leaned on for a sub-pixel claim.

verify-capture now poses the title at t=357.7 rather than 355: RMSE 21.07 → 20.92, differing 1.82 % → 1.81 %. Marginal, and it is the right pose for a stated reason rather than a better number.

ptlogo_eff2 is withheld for a better reason than mine

I was withholding it out of caution about untested generalisation. The Decoder points out something stronger: it is on title_jp, and MISSION §7 scopes out "localisation beyond English" — so it is not a question the menu port has to answer at all, and the parked Japanese-locale capture does not need reviving on its account. authored/rendering.json now says that first and the undecidability second. Widening scope to close a residual would have been the wrong trade, and it is the human's call either way.

🔴 The focus ring had silently stopped, and BLOCKED had listed it

docs/port/BLOCKED.md said the record-layout change touches five things: pose_at, settle_units, spin_period_units, exit_ramp_units and the plate. I checked pose_at and deleted exit_ramp_units, reported that, and did not work the rest of the list.

spin_period_units required "the first timed and the second untimed". Under the corrected layout the ring reads t=0 rot=0 and t=120 rot=360 — both timed — so the rule returned 0 and the focus ring stopped spinning. Nothing reported it: a period of 0 is a legal "this element does not spin".

Rewritten to take the span between the two poses. On the ring that is 120 − 0 = 120 units, the same number the old rule produced, which is a small piece of evidence that the corrected layout is self-consistent rather than merely different.

Verified the way P5 verified it — bit-identity one period apart, on the ring's own 60×60 box so the ptloop sweeps cannot confound it:

separation	mean difference
+120 units (one period)	0
+120 units again	0
+30 units (quarter)	8.61
+60 units (half)	8.88

⚠️ Getting there took three wrong instruments, and the sequence is the lesson. A whole-frame max saturates on one rotating edge — adjacent frames scored 131 while their mean was 0.022. A live --menu filmstrip jitters by up to a frame, which is ~3° of ring, and its cadence cannot be pinned. And a whole-frame comparison is dominated by the sweeps, which move 480 px over one ring period. --focus=<id> was added so a --screen run can draw a focus record deterministically, which is what made the check reproducible at all.

The plate's period is now the disc's 105, and it disagrees with the measurement

Under the corrected layout ptbtn00f runs t=0 (alpha 0) → t=105 (alpha 0) — a closed cycle with every pose timed.

✅ The ambiguity this entry carried is gone. It used to say the cycle might restart at t=6 rather than 0, giving 123 units, and that nothing separated the two. There is now one reading.

🔴 And the number is worse against the oracle, which is stated rather than avoided. 105 units is 1.750 s; scaled by the factor the ring shows between its declared 120 units and its measured 2.177 s (×1.089), 1.906 s — about 17 % below every one of the corpus's four timings (2.12 / 2.19 / 2.34 / 2.31 s). The old 129 gave 2.34 s, at the top of that range, which is exactly why it looked right.

129 was the last timed keyframe plus exit_ramp_units, and that constant is deleted. A period built from a constant that no longer exists cannot stay, even though it fitted better. So the port ships the disc's number and says it is wrong, rather than keeping a number that agreed with the measurement for a reason that has evaporated.

Verified: the plate is bit-identical 105 units apart (mean diff 0) and differs at 30 units (0.83). ❔ What would resolve the disagreement: whether the group loops from its start at all, or holds at alpha 0 between cycles. Asked.

The plate's period is 120, decoded — and it was falsified with my own ring number

The Decoder found it in the format: a nested record is itself a RATC bundle, and its header's +0x08 is the loop length — the same field ui_header_time_disc already tests at the top level. A record's keyframes need not fill it, and the slack is a hold at the final pose. ptbtn00f is 105 units of ramp inside a 120-unit cycle, so the glow rests dark for 15 units. The five ptbtn0Nf records fill their 120 exactly, which is what shows the slack belongs to that record rather than to the format.

Disc-wide over 1 781 timed nested records: 92.3 % declare exactly their last keyframe time, 7.7 % declare more, 0 declare less. That last row is the falsifier — a cycle cannot restart before its own last pose — and it never fires.

The decisive test used this port's number, not theirs

Both candidates need the same emulator pacing factor, and the ring measures it independently: declared 120 units → 2.177 s → 1.0885.

plate period	nominal	factor needed for the measured 2.12–2.34 s
105 units	1.750 s	1.211 … 1.337	🔴 excludes 1.0885
120 units	2.000 s	1.060 … 1.170	✅ contains it

105 cannot reach the measured range under any pacing the ring also satisfies. Two different elements in different bundles, measured in separate runs, tied only by both declaring 120.

⚠️ My three readings of this number, in order, are the useful record: 129 (105 + exit_ramp_units) fitted the measurement for a reason that later evaporated; 105 (the group length) I shipped knowing it was 17 % short; 120 is decoded. And the 123-vs-129 pair I once called unseparable straddled the right answer without containing it — which is the sharpest argument I have seen against treating "two candidates, nothing separates them" as if the truth must be one of the two.

Verified: bit-identical 120 units apart (mean diff 0), 0.061 at a quarter and 0.888 at half. Still authored, because the pinned tag does not expose +0x08 yet — delete the entry the day a tag does.

Their rest() flag, checked rather than assumed

They warned that a focus record is exactly the kind of element rest() mishandles, since a pulse's last hold is not its resting state. Censused: 34 focus-record elements in the export, and only 2 have a varying alpha — both ptbtn00f, EN and JP. Their rest.alpha is 80, identical to their peak, which is precisely the pathology described. The port does not hit it because the plate is drawn through the loop path, and the other 32 are constant-alpha, so rest() is safe for them. Bounded, not hoped.

✅ A settled screen is ONE instant, and it collapsed three residuals at once

The Decoder's finding, applied: rest() returns each element's last hold keyframe chosen independently of every other element. That is right for anything that ends the screen settled and exactly wrong for a transient — the title's ptlogo_back2eff1 is a two-frame flash (0 until t52, 255 at t54–56, 0 by t58), so its last hold is the flash peak and rest() left it burning. There are five of them, and rest() drew all five at once.

The settled instant is the longest interval containing no keyframe time, over a bundle's top-level elements. Reproduced independently here before adopting: title [160, 236], midpoint 198 — the Decoder's number to the unit. ⚠️ The top-level restriction is what makes it match: including the ptloop leaves gives [269, 540] instead.

Against the oracle

screen	before	after
title	20.92 RMSE, 1.81 %	14.61 RMSE, 0.26 %
publisher_logo	9.05, 0.75 %	2.17, 0.01 %
developer_logos	8.86, 0.33 %	3.05, 0.01 %
main_menu	0.08 %	0.08 % — unchanged, window too narrow
extras	0.19 %	0.19 % — unchanged, window too narrow

Seven times fewer differing pixels on the title, seventy-five times fewer on the publisher splash, whose differing region is now a 13×18 box. This is the largest correctness gain the port has had, and none of it is mine: it is a decode, computed from the keyframe table with no reference to any capture.

⚠️ It is applied only where the window is wide, and that bar is not invented

The widths in this export split with nothing in between: press_start 214, publisher_logo 190, developer_logos 145, title 76 — then main_menu 12, extras 12, the loading screens 8 and 4. A 12-unit "settle" on a menu that builds in until t=70 is a gap between staggered ramps, not a settled pose.

The bar is 30 units: the Decoder's disc-wide census puts the knee there (30 % of bundles ≥ 30, 42 % under 10, the latter mostly loop* fragments meant to be in motion), and this export's own screens sit 4× either side of it with nothing between 12 and 46. Two independent populations agreeing on where to cut is what makes it a bar rather than a preference.

Checked unbroken: the boot pacing is unmoved (developer_logos@4.26, title@7.91, developer agrees) and the scripted walk still runs end to end with focus restored.

Their census, and a framing of mine they sharpened

I reported "34 focus-record elements in the export, only 2 with a varying alpha". Disc-wide it is 210 varying, 202 with rest() at the peak, across 1 130 focus records — 116 in GP_DEBRIEFING_PILOTLOG, 54 in GP_MOVIE_THEATER, 30 in GP_HANGAR_ARSENAL, 8 in GP_LEADERBOARD, and 2 in GP_TITLE.

My 2 is right because GP_TITLE has 2. ⚠️ But "only 2 have a varying alpha" reads as a fact about the format and is a fact about one pak — and the pathology sits in exactly the screens a wider port reaches next. The sentence was true as measured and false as remembered, which is the failure this corpus keeps finding, and it was mine this time.

⚠️ And they corrected a framing I had: I called rest.alpha == peak "the pathology". It is worse than that — a pulsing element has no resting pose at all. The question rest() answers is malformed rather than mis-answered, because the element's state is a phase, not a value. pose_at(t) with t inside the record's own declared cycle is the only well-formed query on one.

🔴 Worth carrying for whenever this port grows: GP_LEADERBOARD's py_ranking_btn01f swings 255 → 127 → 255 with no two adjacent keyframes equal, so rest() falls through to its longest-dwell rule and returns 244 — neither peak nor trough. A glow stuck at its peak is visibly wrong; one stuck at 244 of a 127–255 range looks entirely plausible, and nothing reports it.

✅ And a free second instance of the loop-length decode from a pak neither of us was looking at: py_ranking_btn01f's ramp ends at t=90 inside a declared 120 — 30 units of hold, the same shape as the plate's 105-in-120.

Their "do not draw all five flashes" flag — checked, and it does not apply here

The Decoder armed a draw capture before the title exists and caught the build-in on the console: ptlogo_back2eff1 in frames 130–131, eff2 at 133, eff4 at 133–135 — and eff3 never drawn at all. Not a miss: a flash's peak is 2 keyframe units, which at that run's pacing is 0.85 of a presented frame, so which flashes get sampled is a matter of phase. The console shows a subset on any given play, and the warning was that drawing all five would read heavier than the real thing.

Checked rather than reasoned about. Sweeping the port's build-in with --no-hold:

t	flashes drawn
54, 56	eff1
58	eff2
60	eff2, eff3
62	eff3, eff4
64	eff4, eff5
66, 68	eff5

The port draws them sequentially, never more than two at once, and the two only overlap where their declared windows abut. That is the stagger the disc declares, not a pile-up — the pile-up was the rest() bug, and it is fixed.

⚠️ So the difference from the console is presentation rate, not content. At 60 fps each 2-unit flash gets ~2 frames; at the console's pacing it gets 0.85, so some are skipped. A frame-by-frame comparison of the build-in against a console capture will therefore show flashes the console missed, and that is a fact to know rather than a bug to fix. It is also why the settled-frame comparison — the one verify-capture makes — is unaffected: at t=198 none of the five is drawn.

Three things of theirs worth recording

✅ My top-level restriction was verified, not merely accepted: top-level [160, 236] width 76, versus [269, 540] width 271 with the ptloop leaves included — an instant after every top-level element has exited. Worth having on their page, because the rule as described permits the wrong reading.

✅ The 120-unit loop is confirmed from the guest's own vertex data, not inferred from pixels: the glow quad's per-vertex colour alpha is the element's fade alpha, giving an observed range of 0…80 against a decoded peak of 80, exact and unfitted, over 20 cycle starts. Fitting the decoded ramp gives RMS 13.16 alpha levels against 38.18 for the same ramp reversed — if the shape carried no information those would be equal.

📌 A trap noted for whenever this port grows draw-stream tooling: a 2D draw's identity is its vertex geometry, not its bound texture, because these sprites sample large shared pages. Matching on texture dimensions told them first that no flash is ever drawn, then that ptbase2 and pteff04 are drawn in frames 75–105 — which are the intro movie, whose YUV planes are 640×360 targeting 1280×720. Two errors, opposite directions, one pass, neither loud.

✅ The publisher_logo residual was a missing black hold, and we had both dismissed it

I had carried this as "0.03 s outside a composite bound, probably a property of the bound rather than the game", and the Decoder agreed. We were both wrong, and the way it was settled is the point: I stopped reasoning about the bound and filmed the transition.

At 0.05 s the port fell straight out of the publisher's fade into the developer logos — mean 5.06 → 0.32 at t=4.20, then 5.65 at t=4.25. There was no black frame at all, where the oracle measures a 0.17–0.23 s pure-black plateau (HANDOFF Q7). The bound was fine. The port was missing a fifth of a second of black, and had been since P3.

Authored at 12 units, because on the boot path there is nothing to read it from: publisher_logo and developer_logos each carry a single palogo_eff0 — a 1280×720 primitive with one keyframe at t=0, static, not a transition ramp. The menus' quad declares black for 12 units and 12/60 = 0.200 s sits in the middle of the measured range, so the number is the disc's where a screen has one.

Filmed after: t=4.25, 4.30, 4.35, 4.40 all at mean 0 — four black frames, 0.20 s — then the developer logos at 4.45.

	before	after
publisher interval	4.26 s, DIFFERS	4.47 s, agrees
developer interval	3.62 s, agrees	3.73 s, agrees

The settled-frame comparisons are untouched, as they should be — this is pacing, not pixels.

⚠️ The lesson is about the shape of the dismissal, not the number. "A 0.03 s miss against a bound composed from two measured ranges plus jitter slack is more likely a property of the bound" is a plausible explanation, it was offered and accepted by both of us, and it was wrong. The composite bound was the reason the miss looked small — the underlying gap was 0.2 s — and a plausible explanation for a small number is exactly how a real defect stays hidden. The film cost one command.

ptlogo_back2eff3 — recorded, deliberately not acted on

The Decoder has reproduced across two independent build-ins that the console never draws eff3: 0 draws against ~5 expected, while eff1 gets 4, eff2 3 and eff4 6. Three explanations are ruled out — sampling phase (eff3 is non-zero over six units against a 2.23-unit step, and frames at t=60.1 and 62.3 sit inside it drawing eff2 and eff4 instead), a draw the log cannot see, and a bad position guess (no quad anywhere is within ±30 of the expected 408 width; the spectrum jumps 262 → 748).

❔ But why is not established — nothing in eff3's record differs from its neighbours: same kind 0x0, same keyframe shape, same u4/u8, same scale.

🔴 So the port keeps drawing it, and that is a decision rather than an oversight. Dropping an element the disc declares, on a measurement with no mechanism behind it, is authoring a behaviour neither agent can derive — and nothing this port gates on would notice either way: the flashes live only in the build-in, and verify-capture compares the settled frame at t=198 where none of the five is drawn. Acting would buy no measurable fidelity and cost an unexplained exception in authored/.

What would change it: a mechanism in the record, or a gate that measures the build-in against a capture. Until then the port is visibly wrong for two frames during a build-in nobody compares, which is the cheaper of the two wrongs.

The narrow settle windows are harmless, and I can now say why

Adopting the settle instant left main_menu and extras on per-element rest() — their windows are 12 units, below the 30-unit bar — and I recorded that as a gap. It is not one. rest() is malformed only for a transient, and the transients are precisely on the screens whose windows are wide:

screen	window	transients
title	76	ptlogo1/ptlogo2 ×4, pteff01, ptlogo_back2eff1…5, ptlogoall_eff
publisher_logo	190	palogo_sqex_eff
developer_logos	145	palogo_*_eff ×3
main_menu	12	none
extras	12	none

The discriminator is returning to dark far before the screen's own end — ptlogo_back2eff1 is dark again at t=58 while the title runs to t=269 — as opposed to the ordinary fade-in-hold-fade-out that every menu element has, where rest at 255 is the settled pose and the final 0 is the exit.

⚠️ I am not claiming that as a rule. Two screens having narrow windows and no transients could be coincidence; it is n = 2, and n = 2 is where I have gone wrong before. What it does mean is that nothing measurable is being left on the table by the 30-unit bar today.

Refuted, mine — "the menu residual is localised on the ptloop sweeps"

I have written that twice. It came from reading the bounding box of the differing pixels, which sat at (441, 230) — the sweep position. Tested by sweeping the leaf's phase against the live-menu captures:

main_menu, sweep phase	differing
t=60 (barely on screen)	0.063 %
t=350 (mid-screen)	0.183 %
t≥600 (parked off-screen)	0.061 %

✅ Two things fall out. The capture shows no sweeps: the port matches best when they are off-screen and three times worse when they cross the middle. And with them parked the residual's box is 834×358 at (445, 167) — the button column, which is where the focus signature lives, not the sweep position.

On extras the same test moves the box (398×295 at the sweep position at t=70, 736×525 spread at t=700) while the magnitude barely changes: 0.192 % against 0.200 %.

🔴 So the box moves with the sweeps and the residual does not. A bounding box over scattered pixels tells you where the outermost differing pixels are, not where the difference is — and I had been quoting it as if it localised a cause. verify-capture prints that box, so this is a caution about reading my own tool.

And a first piece of evidence on whether the sweeps loop

The disc gives one pass, t=0…600, ending parked off-screen at x=1521. ORACLE-CAPTURES.md says the title's sweeps "move continuously", which I had taken as implying a loop. The idle main-menu capture matches best with them off-screen, which is evidence they run once and park.

⚠️ One capture, one screen, and "best match" is a weak instrument for an absence — but it is the first evidence either way, and it points against looping. The loop-length field the Decoder decoded (+0x08 of a nested record's header) would settle it outright; it is not in the pinned tag.

Refuted — "the developer splash is one composited quad, the bounding box of the three logos"

The Decoder observed the game submitting one 525×259 quad at (378, 155) on the developer splash and read it as the bounding box of the three logos, warning that drawing three sprites there draws something the console does not. The arithmetic does not support it, and the port keeps drawing three.

	bounding box
the three logos	500×421 at (390, 164)
gamearts_eff + seta_eff	521×261 at (379, 154)
the observed quad	525×259 at (378, 155)

A 259-tall quad cannot contain the three logos, which span y 164…585: palogo_anima alone starts at y = 449, thirty-five pixels below that quad's bottom edge. The observed quad matches the union of the two _eff glows to about four pixels in every dimension.

⚠️ And those two are transients — my own census flagged them, dark again by t=45 — so a frame containing that quad is a build-in frame, not the settled screen. Consistent with a draw capture that starts early, which is exactly what theirs does.

I cannot see their draw stream, so I have sent the arithmetic rather than a verdict. What I will not do is stop drawing an element on a claim whose stated identification excludes that element from its own bounding box.

The black hold is 9 units, not 12 — measured in draws rather than luminance

I authored 12 from HANDOFF Q7's luminance plateau of 0.17–0.23 s, supported by the menus' transition quad declaring black for 12. The Decoder counted submitted quads instead, which is the better instrument: luminance cannot separate the outgoing fade's tail from true black.

Frames 21–125 submit palogo_sqex fading to alpha 7; frames 126–129 submit no sprite quad at all; 130–153 fade the developer splash in from alpha 34. Four presented frames at 2.284 units/frame — a rate derived from the disc as its own clock, because that run ran at 13.1 fps against 28 elsewhere — gives 9.1 units = 0.152 s, ±1 frame 6.9–11.4.

⚠️ It disagrees with the luminance figure and the disagreement is the point. 0.114–0.190 s against 0.17–0.23 s overlaps only at the top, and the true black is shorter than 9 even so: both boundary frames still carry picture. My 12 was also supported by analogy — a different screen's quad on a different path, where the boot splashes carry no quad at all. A number that fits by analogy loses to one measured in place.

verify-dwell's bound moved with it. Both screens still agree: publisher 4.42 s, developer 3.78 s.

The title's sweeps loop — measured, and the field could not have told us

The disc gives one pass (ptloop01 t=0…600, ptloop02 t=0…720), each ending parked off-screen, and the port ran them once. The oracle says they loop: across two title dwells the sweep quad oscillates over its whole x range and resets hard to the same start — one reset in the first dwell, two in the second.

🔴 And the loop-length field could not have settled it, which corrects a hope I had stated. Both records declare exactly their last keyframe time — slack zero — and "loops at 600" and "runs once for 600 and stops" write the identical header. 92.3 % of records on the disc are in that state, so the field discriminates only where there is slack, as the plate's 105-in-120 had.

Implemented and verified on the two sweeps' least common multiple, since they have different periods: 600 and 720 realign at 3600 units = 60 s.

separation	mean difference
+3600 units (LCM)	0
+1800 units	0.438
+600 units (ptloop01 only)	0.100

⚠️ Scoped to the title, because that is where it is measured. The menus declare the same 600/720 and nothing on the disc distinguishes them, but my own weak evidence points the other way there — sweeping the phase against live-main-menu.png, the port matches best with the sweeps off-screen (0.061 %) and three times worse mid-screen (0.183 %), and if they looped the sweep is on screen for roughly 73 % of the cycle. Two weak signals in opposite directions is a reason to scope, not to pick.

The menus' residual is the tone floor, not structure — and extras is not really 3× worse

extras sits at 0.19 % differing against main_menu's 0.06 %, on two screens of the same family, and that gap wanted explaining.

Signed difference (port − capture), by cell:

	x=0	x=320	x=640	x=960
extras y=169	+12.13	−3.64	+2.43	+10.60
extras y=338	+12.29	+1.36	+1.42	+9.05
main_menu y=169	+11.63	−0.68	+3.01	+10.24
main_menu y=338	+11.03	+3.93	+2.92	+8.84

The two screens are nearly identical, and the port is uniformly +9 to +12 brighter in the dark outer columns — which is exactly the transfer curve I measured earlier: γ > 1 in the darks, capture darker than render. There is no dipole, no displacement, no missing element.

So the 0.06 % / 0.19 % gap is not a difference in fidelity. The thresholded count only sees pixels differing by more than 64 levels, which are text and sprite edges; the two screens simply have different amounts of high-contrast edge. The level disagreement, which is what a tone term produces, is the same on both.

⚠️ This is the bounding-box lesson again in a different costume. I had two numbers, 0.06 and 0.19, and took the ratio as meaningful. It is a count of threshold crossings, and a count of threshold crossings is not a measure of how wrong a screen is.

A diagnostic trap of my own, worth writing down

My first pass at this reported 10 of 18 elements "transparent at rest" on extras — the buttons, the title, the frames — and looked exactly like a missing-element bug. It was not. --screen=NAME without --time renders at t = 0, and pose_at clamps t to minf(t, settle_units), so t=0 stays t=0 and every element is still at its first keyframe. Passing --time=2.0 draws 18 of 18.

The tool was right and my invocation was wrong, and the failure looked like a serious defect rather than an empty argument. Same family as the instrument traps this session has collected — and mine was the one that reported a worse problem than existed, which is the direction that wastes an iteration rather than hiding one.

Refutation attempt — their 239.8-unit figure, checked from my export

The Decoder converted the boot's black gap using the disc as its own clock: "palogo_sqex declares alpha ≥ 1 for 239.8 units and is drawn in 105 frames → 2.284 units/frame." That 239.8 comes from their reading of the record; I have the same element in my export and can compute it independently.

palogo_sqex ramps 0 → 255 over t=15…30 and 32 → 0 over t=251…255. Under the linear ramp the port already uses, alpha first reaches 1 at t = 15.0588 and last exceeds it at t = 254.8750:

239.816 units.

✅ Survives, to four significant figures. It matters more than a spot-check: that number is the denominator of the units-per-frame conversion behind the 9-unit black hold I just authored, so an error in it would have propagated straight into a constant I ship. Two derivations from different sides of the same record agreeing to 0.02 % is what makes that constant safe to hold.

🔴 The loading screens are black at every instant — which proves the layer rule wrong for a layerless element

build_12 and build_15 have rendered blank since P3, and I had filed it as a rest() casualty: pgloading_eff00 is a 1280×720 quad whose rest is opaque black. It is not that, and the corrected keyframe association makes it provable rather than suspected.

Every element's declared alpha window on build_12:

element	opaque / visible	gone by
pgloading_eff00 (black quad)	t=0 … 38 at alpha 255	clears at t=48
pgloading_loop4	t=8…32	38
pgloading_loop1	t=16…32	40
pgloading_line	t=18…26	32
pgloading_str	t=22…28	34
pgloading_loop3	t=24…26	34
baseeff, eff01, eff02, loop5	t≈16…32	32–40

The quad is fully opaque across the entire span in which any content is up, and it only clears at t=48 — by which time every other element has faded to zero. Rendered at t = 20, 30, 36, 40, 42, 44, 46, 50 units with the timeline playing, the frame is mean 0 at every one.

So this is not a bad choice of pose. Under the port's current layer rule there is no instant at which this screen shows anything, and a loading screen that is black for its whole life is not what the game does. That is a proof by contradiction, not a preference.

The rule under suspicion is mine, and it is narrow

pgloading_eff00 carries layer_source: "none" — no layer key at all — and the exporter sorts a layerless element last, i.e. on top. Its paint_order is [6, 7, 8, 9, 1, 5, 4, 2, 3, 0] with element 0, the quad, drawn last.

⚠️ Every other full-frame primitive in the export has a layer key — main_menu, extras and title all give their pteff00 0x00008030 — so this rule only ever bites here, which is exactly why it survived eight milestones behind two screens nobody draws.

❔ Where a layerless element sorts is a decoding question and I am not answering it. If the game sorts it first — behind everything — the screen renders and the quad becomes a backdrop rather than a cover, which is what a 1280×720 black rectangle at the bottom of a loading screen would sensibly be. That reading is consistent with the contradiction above, which is not the same as being established, and I have asked rather than flipped the sort.

✅ What this does settle: verify-screen's BLANK verdict on those two rows was the right call. It reports that both renderers drew nothing and that the row proves nothing — and sylpheed-cli agrees with the port here precisely because it shares the assumption under suspicion. Two renderers agreeing, again.

Their eff3 retraction — my refusal was right, and my refutation found the same bug

The Decoder has withdrawn "the game never draws eff3". It draws all five, in the declared stagger, in both title entries. And the mechanism was the one my developer-splash refutation had already caught one layer down: a draw batches several quads and the log dumps only the first 8 vertices, so min/max over a line's vertex list merges them. eff3 (788…1196) lies entirely inside eff4 (447…1196), so the union is exactly eff4's extent and eff3 vanished with nothing anomalous to see. My 525×259 was gamearts_eff merged with seta_eff by the identical mechanism.

⚠️ The part worth carrying is theirs: three explanations were reported "ruled out", and all three were aimed at the wrong failure — the "a draw the log cannot see" check counted draws with no geometry when the hiding place was draws with partial geometry. Refuting three wrong hypotheses is not evidence for a fourth, and a list of failure modes written by whoever built the instrument is the least likely to contain that instrument's blind spot.

Nothing in the port changes: eff3 was never dropped, and the developer splash still draws three sprites.

The forced backdrop: two of sixteen screens were black for their whole life

build_12 and build_15 — the two dressed loading screens — rendered as pure black at every instant of their declared timeline. Not at rest, where a wrong rest.t could explain it: at t = 20, 30, 36, 40, 42, 44, 46 and 50 units with the timeline playing, mean 0 in every frame.

That is not a defect you can attribute to a pose. A screen that is black for its entire life is impossible on its face, and it is the kind of impossibility that survives a render-vs-render diff: verify-screen scored those two rows max 0 mean 0 over3 0 OK — the strongest verdict that script has, awarded for comparing nothing against nothing. Both renderers were black because both share implied_layer_key. The blank guard now in verify-screen was written after that, and it is what turned the pass into a row that says it proves nothing.

The rule, and whose it is

It is the Decoder's, decoded from the file rather than inferred from the render:

An element that covers the screen and is fully opaque at some instant cannot paint above anything visible at that instant. Where the elements visible during its opaque span are all of them, its position is forced to first.

pgloading_eff00 is a full-screen quad at alpha 255 from t=0 to t=38, clearing at t=48; every other element on those screens peaks around t=8–32 and is gone by t=32–40 — entirely inside the opaque span. Under a layer-key sort it painted over all nine of them, at every instant they existed. Hence black.

What is implemented, and the two limits that are not negotiable

forced_backdrop_first in crates/sylpheed-export/src/screen.rs, as a post-pass over ui_layout::derived_paint_order. Two restrictions are copied from the Decoder verbatim because each one was found by a test that failed:

• 🔴 Elements with no sprite only. Applied to sprites, the rule claimed 22 .t32 textures must sort first against their own layer keys. An element's alpha says nothing about whether its texture covers the screen — most of a sprite may be transparent. The assertion that caught this was one the Decoder had nearly deleted as over-strict.
• 🔴 Not a name heuristic. *base* first / *eff* last matches 77 of 80 and fails on exactly the three families that cross it: palogo_eff0, pgloading_eff00, pzeff00. palogo_eff0.prm is named like an overlay and is measured painting first. The name is not the rule; occlusion is.

⚠️ Reach: it assumes straight alpha-over. Blend mode is undecoded, and an additive quad at alpha 255 would not occlude. It is a lower bound on one element's position, not an ordering — 80 elements are forced, 50 are constrained but not forced, and this says nothing about those 50.

The controls

Both are the Decoder's prior measurements off the running game. No new oracle run was made for this change, by either agent.

primitive	measured	our opaque instants	outcome
palogo_eff0.prm	first	256 (they measured 211)	✅ forced first
pteff00.prm	last	2 (they measured 2)	✅ still last

pteff00 is the one that would break if this were implemented as "push every layerless element down". It is the fade cover: opaque at t=0 and again at t=269, its screen's entry and exit, and transparent for the 253 instants between. The constraint never binds it, and it remains last on all four title-family screens.

The palogo_eff0 count differs — 256 against 211 — because we take the opaque span to the screen's last keyframe (255) and they stop at 210. It changes no verdict here, since the element is opaque across the whole span either way, but the two spans are not the same span and only one of them can be the screen's. Filed in BLOCKED.

An element holds its final pose to the end of the screen; it does not vanish at its own last keyframe. Reading palogo_eff0's span as 0..=0 — it declares a single keyframe — would make the splash's backdrop a one-instant event rather than the thing on screen for the whole splash. Rendering build_12 confirms the hold directly: the frame is constant from t=30 to t=60 with the timeline running.

What changed, measured

• build_12/build_15: mean 0 at every instant → ramps in over t=0…30 and holds (mean 1.95, max 214.5). The two BLANK rows are gone from verify-screen.
• The splashes are unmoved against the oracle: publisher_logo 0.01 %, developer_logos 0.01 % differing region, unchanged before and after. ⚠️ That is non-regression, not confirmation — verify-capture poses at the settle instant, and the ordering does not necessarily bind there. The evidence for the rule is the Decoder's two controls and the impossibility of a permanently black screen, not this row.
• Six verify-screen rows now DIFFER: the six screens the rule touches. The reference sylpheed-cli builds from the workspace sylpheed-formats, which does not have the rule. That disagreement is expected and must not be tuned away — it ends when a pinned tag carries the Decoder's change, at which point this post-pass is deleted rather than kept in two places.

It also explains 36 builds the Decoder had filed as "coming out one colour": pzeff00.prm is forced first in 32 of 32 of them. Those were wiped by our own sort.

Refutation attempt — the forced-backdrop rule's quantifier, and whether it misses a case

The rule fires only when all other elements are visible during the opaque span. That is a strict quantifier, and a strict quantifier fails quietly: an element that is a full-screen opaque backdrop but misses the bar by one dark element would keep its layer-key position and go on hiding the screen, exactly the defect the rule was written to fix. So the question worth asking of somebody else's rule is not "is it right" but "is it enough" — and that one I can test without an oracle, over every layerless full-screen element in GP_TITLE.

screen	element	opaque instants	others visible	forced
build_12, build_15	pgloading_eff00	39	9 / 9	✅
developer_logos ×2	palogo_eff0	211	6 / 6	✅
publisher_logo ×2	palogo_eff0	256	2 / 2	✅
title, title_jp	pteff00	2	3 / 23	—
main_menu ×2	pteff00	2	7 / 15	—
extras ×2	pteff00	2	5 / 17	—
every screen	pteff02	0	—	—

The rule survives, and the margin is the reason. Nothing sits near the boundary. Every element that fires does so at 100 % of the others; every element that does not is at 13–47 %, and pteff02 never reaches alpha 255 at all, so no quantifier could fire on it. There is no borderline case in this archive for a stricter or looser reading to disagree about — which is the answer I could not have gotten by re-checking the six screens where it already fired.

It also reproduces the Decoder's second control number exactly: they report pteff00.prm forced below 3 of 23, and title measures 3 of 23 here. With their opaque-instant count of 2 already matched, two of their three published figures for that control now come out of an independent implementation unchanged. The third — palogo_eff0's 211 against our 256 — remains the span disagreement filed in BLOCKED.md, and note that the 211 is the number our developer_logos row does reproduce. That is worth saying plainly: the disagreement is not a constant offset, so "they stop 45 instants early" is not the explanation, and whatever it is differs per screen.

⚠️ What this does not test: whether the rule is right about the 50 elements it calls constrained-but-not-forced, and whether alpha-over is the blend mode. Both are the Decoder's to settle. It tests completeness within one archive, which is the half I can reach.

The 256/211 was never a disagreement — and my own census had already said so

The Decoder answered the span question, and the answer is that both numbers are right. palogo_eff0.prm appears on both splashes: the publisher pair (entries 10, 13) runs to t=255 and gives 256 instants, the developer pair (11, 14) runs to t=210 and gives 211. I computed the publisher; their page quoted the developer.

Worth noting how that came out, because it is the one part I can claim: the refutation census in the section above reported 256 on publisher_logo and 211 on developer_logos, in the same table, and concluded "the disagreement is not a constant offset, so 'they stop 45 instants early' is not the explanation". The resolution was already sitting in my own output before their reply arrived. What I got wrong was filing it as a disagreement at all — I compared one of my two numbers against one of theirs and did not check the other row of my own table against it. A per-screen quantity needs the screen named next to it, and my BLOCKED.md row named neither.

The span convention, confirmed rather than assumed

The span is 0 ..= max keyframe time over EVERY element in the build, and an element holds its final pose past its own last keyframe.

That is exactly what forced_backdrop_first implements, so nothing changes in the port. Two things they add that are worth having in writing:

• the hold is not a convenience: a group holds at its last keyframe rather than looping, and the header's +0x08 never falls short of the last keyframe — the slack is that hold;
• +0x08 and the elements' maximum are interchangeable, zero disagreements disc-wide. We use the elements' maximum. It stays, and this paragraph is the note that the two were checked equivalent rather than assumed so.

The hold decides 55 % of verdicts, and the oracle picks it

Reported by them over 130 keyless full-screen primitives (their measurement, not reproduced here — their page is docs/re/structures/ui-forced-backdrop.md, ⚠️ not yet on main as of this commit):

alternative convention	verdicts changed
span = the header's declared +0x08	0
span = the primitive's own last keyframe	72
elements gone after their last keyframe	72

So the reading I very nearly shipped — span = the element's own last keyframe — would have changed 55 % of the verdicts disc-wide. My first implementation did exactly that, and palogo_eff0 is the case that catches it: a single keyframe at t=0, opaque for one instant, nothing else up yet, so the rule calls it free — against a game measured painting it first. The convention is not a matter of taste; the oracle rules one out.

✅ None of our six verdicts rests on it. pgloading_eff00 is first under all four conventions and pteff00 is free under all four; only palogo_eff0 moves, and only under the convention its own measured order excludes.

The sharper form of the verify-screen failure

Theirs, and it is better than how I wrote it: those two solid-black frames were not two witnesses. Both renderers read implied_layer_key, so their agreement carried no information — a correlated failure is indistinguishable from a confirmation. What caught it was not a second opinion but that the agreed answer was impossible on its face. "Is this result even possible?" beats "do two implementations agree?" whenever the two share an ancestor, and in this project they nearly always do.

The boot gate still holds

Re-run after the reorder, since the rule changed the paint order of the first two screens in the boot path: publisher_logo → developer_logos → ADV (skipped at 8.12 s) → title + press_start overlay, plate at full alpha at t=236, complete at 10.83 s holding on the title. No script errors.

The clock freezes at settle — the port's settle window, seen from the other side

The Decoder measured GP_TITLE build 4 in the draw stream and found the top-level clock advances through the build-in, stops inside the settle window, and holds. The exit ramp is not on a timer; it plays when something makes the screen leave.

Their interval is [160, 236]. The exporter computes title's settle window as [160, 236, 198]. Those are the same two numbers, and they were not obtained the same way: mine is the longest keyframe-free interval over top-level elements, read out of the file with no game running; theirs is where a captured clock stops advancing. A heuristic I adopted because it collapsed three pixel residuals at once turns out to name the exact interval the game holds in. That is the first evidence for the settle instant that does not come from the port's own renderer.

The file agrees from a third direction: ptcopyright sits at alpha 255 from t=160 to t=238 — it reaches full opacity precisely as the window opens.

Refutation attempt — their declared spans, checked against the file

Their draw-stream argument cites what the file declares, which I can check without a capture:

their claim	the file
ptlogo1 declares an exit at t=264	last keyframe t=264, alpha 0	✅ exact
ptcopyright alpha ≥ 1 for 106 units, t=138…244	keyframes at t=138 and t=244, alpha 0 at both	✅ endpoints exact

Both survive. One quibble, and it is only that: the instants with alpha ≥ 1 number 105, t=139…243, not 106 — the endpoints they bracket with are themselves alpha 0, so 106 is the keyframe span rather than the visible one. It changes nothing in their argument, whose force comes from 1 050 frames against either number.

What this costs the port, and it is not nothing

authored/timing.json and authored/flow.json both said "a screen's dwell is its OWN keyframe group" and "the pacing is the disc's own". 🔴 That is refuted. Build 4 declares about 120 presented frames and dwelled ~1 100 — nine times its own timeline. The group is not the dwell.

The decision is unchanged and still right: hold zero extra rather than invent a number. What was wrong is what the port claimed for it. Leaving when the group ends is not reproducing the disc's pacing — it is leaving at the moment the game starts waiting. Both files now say so, and so does boot.gd, where the comment had inherited the same claim.

✅ The structure was already right, and this is the part the measurement confirms: _advance is caused by the next screen arriving, never scheduled off a timer, and the port's own comment already read "a screen plays itself out because something is taking its place". exit_ramp_units was deleted for an unrelated reason and its absence is now doubly justified.

⚠️ Only build 4 is measured, and build 4 is the one screen where the port is unaffected — it is the boot's end state and holds indefinitely. The two screens this actually governs, publisher_logo and developer_logos, have no measured dwell at all. The port's boot is known too fast on both, by an unmeasured amount. Nothing here is a number for them.

🔴 Withdrawn — "the boot is known too fast". The splash dwells are declared, and the port was already playing them

Last iteration I took the Decoder's build-4 measurement — declared ~120 presented frames, dwelled ~1 100 — and wrote into three files that the port's boot is "known too fast on both splashes, by an unmeasured amount". That is withdrawn. It was wrong, and the way it was wrong is the interesting part.

They then measured the splashes directly, over 3 cold boots:

splash	declared	at 60 units/s	corpus wall clock
publisher (entries 10, 13)	t = 0…255	4.250 s	4.30 / 4.60 / 4.37
developer (entries 11, 14)	t = 0…210	3.500 s	3.51 / 3.50 / 3.37

The developer agrees to 1.1 %, two of its three runs to 0.3 %. And the port emits 4.400 s and 3.650 s — each declared value plus the 9-unit black hold, exactly. ✅ The pacing was right the whole time and no code changes.

What I actually did wrong

Not the arithmetic — the generalisation. Build 4 is the title, whose exit is caused by something outside its timeline, so it holds. A splash's exit is caused by nothing, so it plays its declared timeline and leaves. The title is the exception, not the rule. I had one screen, it was the one screen in the boot the port is structurally unaffected by, and I used it to overturn the two it governs.

I wrote at the time that a ratio from one screen is not a unit of pacing, and declined to scale the splashes by nine. That refusal was right and is the only reason this cost nothing but documentation. But refusing to apply the number while adopting the conclusion it implied was half a caution: I still let one screen's behaviour rewrite what the port claimed about two others. The correct move was to file build 4 as measured and leave the splashes alone, which is what the file now says.

And the unit stays units

🔴 The Decoder's own container timed those same two dwells 15–20 % longer than both the declared values and the corpus — same disc, same declared timeline — and three independent readings of that container's frame rate disagree with each other. A seconds figure is one emulator's pacing on one run. The declared units are on the disc. authored/flow.json dwell therefore takes units, and only for a screen measured to wait beyond its group.

This also retires the "two timestamps would settle it" ask I filed: timestamps were the wrong thing to author, and the measurement's own result says so.

Refutation attempt — their two splash boundaries are not anchored the same way

Their draw stream reports "publisher wordmark frames 6–119" and "developer glows 123, wordmarks 140–209". Taking those spans against the declared groups:

splash	declared units	their frames	units / frame
publisher	255	6…119 = 114	2.237
developer	210	123…209 = 87	2.414

Within one continuous boot, on one guest, those should be the same number. They differ by 7.9 %, and the discrepancy runs the same direction as the error split they have open — publisher +4.1 % where the developer is 1.1 %.

The file suggests why, and it is not the guest's clock: the two boundaries are anchored on different elements. The developer span starts at its glows; the publisher span is reported as starting at its wordmark. Those are 15 units apart — every wordmark on both splashes is alpha > 0 from t=16, every glow from t=1 — and the publisher has a glow, palogo_sqex_eff, visible t=1…44, structurally identical to the developer's three. So either frame 6 is the publisher's glow and is mislabelled, or the publisher span genuinely starts 15 units later than the developer's and the two are not comparable quantities.

⚠️ I cannot tell which from here — it is their log, and the answer is one grep for palogo_sqex_eff in it. Recording it because a 7.9 % internal inconsistency and an unexplained 4.1 % error on the same screen are more likely one problem than two. ⚠️ It also does not touch the corpus comparison, which is a separate instrument (3 cold boots, not this draw log); their 4.1 % may still be real.