de25787d84
Three findings, two of them defects in my own checkers. Changing the KIND of quantity answered the P4 fidelity question on the first attempt. Four attempts at sample-exact difference-signal alignment produced four failures and no verdict -- well past the Decoder's rule that two failed attempts at the same measurement are evidence the quantity is wrong, not the parsing. Band energies need no alignment at all: both transcodes match their sources to 0.66 dB worst-case across four bands, while an unrelated movie lands at 19-20 dB. Two populations an order of magnitude apart, so the 1.5 dB tolerance sits between measured values rather than being picked. Asserting in check-all with the known negative on every run, not behind a flag. It also diagnoses the failure it replaced: matching spectra mean same content at same level, so the difference signal's failure is my alignment, now by evidence rather than assumption. The difference path stays report-only. Band agreement cannot tell a faithful transcode from one that kept the spectrum and mangled the waveform -- weaker than P4 wanted, and what I can support. check-claims held 'no loop-point field has been identified' in its register the whole time and matched case-sensitively, so a capital N at the start of a sentence hid a registered dead claim in BLOCKED.md -- the one document whose job is to say what is still open. The correction had reached authored/audio.json and not the blocked list, which is exactly the failure that file's own why warns about. Matching is case-insensitive now and immediately surfaced five more unmarked sites, including a whole DECISIONS section still describing the refuted state. All six fixed: four tokened, two rewritten with the shipped values. Controlled with a planted capitalised revival. And --control caught its own harness: it perturbed only the first occurrence of an anchor, and the Decoder's delivery heading now appears twice, so the check read the untouched duplicate and passed a wrong contract. A perturbation that does not reach every copy makes a check untestable silently. First time a control has failed because of a change in someone else's document rather than my code. Not accepted from the same message: the (A)-skips-a-movie row is NOT stale. It reads (a) ANSWERED, cites Q9, and points at flow.json's skippable: true. Reported back rather than quietly 'fixed' -- marking a live row stale is the error their own message is about. Every asserting check passes. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N7FiFFFwbvG2uxdcEh8HyF
Sylpheed
A clean-room reverse engineering and port project for Project Sylpheed: Arc of Deception (Xbox 360, 2007).
Three things live here, in one repository so that a change spanning them lands as one commit:
| The decoders | crates/sylpheed-formats — the disc's formats, read and verified disc-wide |
| The port | port/ — a Godot 4 project, plus crates/sylpheed-export which converts a disc into the open asset tree it reads |
| The corpus | docs/re/ — what has been reverse engineered, with its evidence, its retractions and its dead ends |
You need your own copy of the game. No game content is in this repository and none ever will be. The exporter reads the disc you supply.
The oracle is the real game
sylpheed-cliand the Explorer are tools for verifying our decoding. They are hypotheses under test and they have been wrong. When something must be checked against the truth, the truth is the game running in Xenia Canary, captured — not any renderer of ours.
This is stated first because getting it backwards is the most expensive mistake this project has made.
Layout
crates/
sylpheed-formats/ the decoders. Disc-wide verified; the corpus is its spec
sylpheed-cli/ headless tools -- render a screen, dump a table, probe audio
sylpheed-viewer/ the Explorer: a human's window onto the disc. STATIC data only
sylpheed-export/ disc -> the open, moddable asset tree
port/ the Godot 4 project. Reads open formats ONLY
authored/ decisions that are NOT on the disc, each with its reason
data/
base/ generated by the exporter. Gitignored, never hand-edited
mods/ drop-in overrides. Yours
docs/
re/ the corpus: findings, refutations, method traps
game/ how the game is navigated -- menus, modals, flight
port/ the port's mission, its handoff contract, modding rules
agents/ how the agent team works together
tools/ capture harnesses, probes, the share tool
exchange/ transient inter-agent files. NOT in git
docker/ the agent containers
Where to start
docs/re/INDEX.md— what is decodeddocs/re/REFUTED.md— what has been tested and dieddocs/re/METHOD.md— traps this project has already paid fordocs/game/navigation.md— how the game is navigateddocs/port/MODDING.md— why the asset tree looks the way it does
Xenia Canary is a separate repository: it is a fork tracking upstream, and it carries our instrumentation.
Conventions
Confidence is per claim, never per document: ✅ CONFIRMED · 🟡 PROBABLE ·
❔ HYPOTHESIS · ❌ REFUTED. A withdrawn result is kept with its reasoning
rather than deleted — that is why the numbers here can be trusted.