re: there is no XACT container on this disc -- retracting my own lead and

closing Q8

Last iteration I named Pj_Silph.xgs as the route to the SE cue index, on
the reasoning that XACT keeps cue->wave there. That route is dead, and
the negative is properly bounded: its 533-byte entry is high entropy with
no XGSF magic, +/-8 KB around it has none either, all 1.08 GB of
sound.pak contains zero XGSF, SDBK and WBND, and the executable has no
XACT or .xgs string anywhere. Control run first -- the same scan finds
RIFF in BGM_001 exactly where the bank structure says it should be, so
the scan works and the magic genuinely is not there.

So the .xgs and .slb extensions came from the authoring tool and survived
into shipped data that is not XACT at all. That goes in METHOD as a
general trap: check for the magic before committing to a parser for the
format an extension advertises. Writing an XACT parser would have been
wasted work.

What that leaves for the SE audio is undecodable-with-reach rather than
pending: Static.slb has no wave boundaries, there is no project file, and
none of the sound table's five records carries an offset. The bank is
certainly the right one -- 8 353 472 bytes over 322 cues is 0.84 to 1.01
seconds each at the bitrates the disc uses elsewhere, exactly the shape
of a bank of short effects. Only the index into it is missing, and it
exists only at runtime.

Q8 closes: vocabulary and bank decoded, the event binding a name match on
the authors' own event names, and the audio explicitly something the port
must source or author rather than extract. With this every MISSION row is
answered.

docs/port/HANDOFF.md

@@ -34,7 +34,7 @@ authored version can be deleted.
 | Q5 | navigation semantics | ✅ answered | **measured**: initial focus varies boot to boot (2× `TUTORIAL`, 1× `NEW GAME`); ⬆⬇ one step, **wraps both ends**; ⬅➡ do nothing; Ⓑ returns to the parent **with focus restored**; Ⓑ on the main menu → title; Ⓑ on the title → nothing — [`menu-navigation-semantics.md`](../re/menu-navigation-semantics.md) |
 | Q6 | boot sequence + what drives it | ✅ answered | sequence **measured** end to end; the driver is **code, not data** — four search spaces closed, so the port **authors** the sequence — [`boot-config-and-gamepart-registry.md`](../re/boot-config-and-gamepart-registry.md) |
 | Q7 | transitions | ✅ answered | a **fade through black**, drawn by the screen's own last-painting `.prm` quad. Fade-in ramp is **decoded** from its keyframes; the ~0.4 s fade-out is **measured** (not in the file) — [`screen-transitions.md`](../re/screen-transitions.md) |
-| Q8 | menu audio bindings | 🟡 mostly answered | the **UI cue vocabulary is decoded** (`SE_UI_CURSOR`/`DECIDE`/`CANSEL`/`IMPOSI`, all in `Static.slb` per `BANK_SE`); the event binding is a **name match**, and the SE audio is **not extractable yet** — [`menu-audio-cues.md`](../re/menu-audio-cues.md) |
+| Q8 | menu audio bindings | ✅ answered | cue vocabulary + bank **decoded**; event binding is a **name match** (the authors' own event names); SE audio is **undecodable from the disc** — no XACT container exists anywhere — [`menu-audio-cues.md`](../re/menu-audio-cues.md) |
 | Q9 | video binding + playback rules | ✅ answered | **decoded** from the movie manifest: `ADVERTISE_MOVIE`→`ADV.wmv` (boot intro *and* attract are one asset), `MS00A`→`S00A.wmv` is the new-game intro, `STAFF_ROLL`→the credits reel. ✅ **one Ⓐ skips a movie** (title at 57 s vs a 193 s baseline) — [`movie-binding.md`](../re/movie-binding.md) |
 | Q10 | music-bank sub-wave roles (intro+loop?) | ✅ answered | **two stems of one performance, played together** — sample-synchronous, equal duration, 32/32 banks. **Concatenating is wrong.** Not a seamless loop either — [`structures/bgm-two-stems.md`](../re/structures/bgm-two-stems.md) |
 | S1 | Ready Room go/no-go | ✅ **no-go** | it is 2D and enumerates fine (60 builds), but `GP_READY_ROOM.pak` holds **briefing/tactical-map** content, not the six-button Ready Room menu — [`ready-room-probe.md`](../re/ready-room-probe.md) |
@@ -156,10 +156,15 @@ authored version can be deleted.
   🟡 **Which event fires which cue is a name match**, not a measurement — strong,
   because these are the authors' own event names, but nobody has watched the game
   emit cue 2 on a d-pad press. The port is authoring it.
-  ❔ **The SE audio cannot be exported yet.** `Static.slb`'s 8 353 472 readable
-  bytes contain **0 `RIFF`, 0 `seek`, 0 `WAVE`** — the boundary marker that works
-  for all 7 620 other banks is simply absent, so an individual cue's wave is not
-  locatable. Next step is `Pj_Silph.xgs` (in `sound.pak`, TOC 9454).
+  ❔ **The SE audio cannot be exported at all from the disc.** `Static.slb`'s
+  8 353 472 readable bytes contain **0 `RIFF`, 0 `seek`, 0 `WAVE`** — the boundary
+  marker that works for all 7 620 other banks is absent — and there is **no XACT
+  container anywhere**: 0 × `XGSF`/`SDBK`/`WBND` across all 1.08 GB of
+  `sound.pak`, and no `XACT`/`.xgs` string in the executable. The `.xgs`/`.slb`
+  names come from the authoring tool, not the shipped format. The bank is
+  certainly the right one — 8 353 472 B over 322 cues is 0.84–1.01 s each at the
+  disc's own bitrates — but the index into it exists only at runtime. **The UI
+  sound effects must be sourced or authored; they cannot be extracted.**
 
 * **The boot sequence is not data-driven — the port authors it.** ❔ Four places
   were checked and the order is in none: `config.ini`'s `[SYSTEM]` is empty, the