diff --git a/.gitignore b/.gitignore
index 72134dc9..d1c3ae91 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,14 @@ Thumbs.db
 # Trunk build output
 dist/
 __pycache__/
+
+# ── The port ────────────────────────────────────────────────────────────────
+# Generated from the user's own disc. This repo stays clean-room: code, schemas,
+# authored mappings and documentation only -- never game content.
+/data/base/
+# Transient inter-agent files. Deliberately outside history: they are working
+# artefacts with provenance in their manifest, not results.
+/exchange/
+!/exchange/.gitkeep
+.godot/
+port/.godot/
diff --git a/Cargo.toml b/Cargo.toml
index 87d06cd4..ea7604ff 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,7 @@ members = [
     "crates/sylpheed-formats",
     "crates/sylpheed-viewer",
     "crates/sylpheed-cli",
+    "crates/sylpheed-export",
 ]
 resolver = "2"
 
@@ -11,7 +12,7 @@ version = "0.1.0"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 authors = ["Project Sylpheed Reborn Contributors"]
-repository = "https://github.com/sylpheed-reborn/sylpheed-reborn"
+repository = "https://git.mc02.dev/fabi/Sylpheed"
 
 [workspace.dependencies]
 # ── Format / parser crates ──────────────────────────────────────────────────
diff --git a/README.md b/README.md
index 9adf135a..79014b26 100644
--- a/README.md
+++ b/README.md
@@ -1,225 +1,66 @@
-# Project Sylpheed: Arc of Deception — Reborn
+# Sylpheed
 
-A clean-room, open-source reimplementation of **Project Sylpheed: Arc of Deception** (Xbox 360, 2006).
+A clean-room reverse engineering and port project for **Project Sylpheed: Arc of
+Deception** (Xbox 360, 2007).
 
-Built with **Rust** and the **Bevy** game engine. Runs natively on Windows, macOS, and Linux, and in the browser via WebAssembly.
+Three things live here, in one repository so that a change spanning them lands as
+one commit:
 
-> **Legal note:** This project contains no original game code or assets. You must own a legitimate copy of Project Sylpheed to use this engine. Assets remain the intellectual property of SETA Corporation / Square Enix.
+| | |
+|---|---|
+| **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.
 
-## Current Status: Milestone 1 — Asset Explorer
+## The oracle is the real game
 
-- [x] XISO disc image reading via `xdvdfs`
-- [x] Xbox 360 texture de-tiling (Morton / Z-order)
-- [x] XPR2 texture container parsing
-- [x] Bevy custom `AssetLoader` for `.xpr` textures
-- [x] Orbit camera viewer
-- [x] CLI tools: extract, list, sniff, texture info, texture export
-- [x] GitHub Actions CI (Windows + macOS + Linux + WASM)
-- [x] WASM / web build target
-- [ ] Mesh format (reverse engineering in progress)
-- [ ] Audio format (XMA → PCM pipeline)
-- [ ] Mission data format
+> `sylpheed-cli` and 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.
 
-## Repository Structure
+## Layout
 
 ```
-sylpheed-reborn/
-└── sylpheed-viewer/        ← Milestone 1: asset explorer (Rust/Bevy workspace)
-    ├── Cargo.toml          ← Workspace root
-    ├── crates/
-    │   ├── sylpheed-formats/   # Format parsers — no Bevy dependency
-    │   │   ├── xiso.rs         # XISO / XDVDFS disc image reader
-    │   │   ├── texture.rs      # XPR2 container + DXT de-tiling (Morton)
-    │   │   ├── vfs.rs          # Virtual filesystem + magic-byte sniffer
-    │   │   ├── mesh.rs         # Mesh parser (stub — RE in progress)
-    │   │   └── audio.rs        # Audio parser (stub — XMA TODO)
-    │   │
-    │   ├── sylpheed-viewer/    # Bevy application
-    │   │   ├── lib.rs          # App setup + WASM entry point
-    │   │   ├── main.rs         # Native binary entry point
-    │   │   ├── asset_loader.rs # Custom Bevy AssetLoaders
-    │   │   ├── camera.rs       # Orbit camera (LMB orbit, RMB pan, scroll zoom)
-    │   │   └── ui.rs           # egui file browser + RE notes panel
-    │   │
-    │   └── sylpheed-cli/       # Command-line tools
-    │       └── main.rs         # extract / list / sniff / texture info commands
-    │
-    ├── assets/             ← Extracted game files (gitignored)
-    ├── .github/workflows/
-    │   └── ci.yml          # CI: Windows + macOS + Linux + WASM
-    ├── Trunk.toml          # WASM build configuration
-    └── justfile            # All build recipes
+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
 
-## Getting Started
+* [`docs/re/INDEX.md`](docs/re/INDEX.md) — what is decoded
+* [`docs/re/REFUTED.md`](docs/re/REFUTED.md) — what has been tested and died
+* [`docs/re/METHOD.md`](docs/re/METHOD.md) — traps this project has already paid for
+* [`docs/game/navigation.md`](docs/game/navigation.md) — how the game is navigated
+* [`docs/port/MODDING.md`](docs/port/MODDING.md) — why the asset tree looks the way it does
 
-### Prerequisites
+Xenia Canary is a **separate** repository: it is a fork tracking upstream, and it
+carries our instrumentation.
 
-```bash
-# Install Rust
-curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+## Conventions
 
-# Install just (task runner)
-cargo install just
-
-# For web builds only
-cargo install trunk
-rustup target add wasm32-unknown-unknown
-```
-
-#### Linux — Bevy system dependencies
-
-```bash
-sudo apt-get install -y \
-  libasound2-dev libudev-dev libwayland-dev \
-  libxkbcommon-dev libx11-dev libxi-dev pkg-config
-```
-
-### Step 1 — Extract your disc
-
-```bash
-cd sylpheed-viewer
-
-# Extract using the CLI tool
-just extract /path/to/project_sylpheed.iso
-
-# Or manually with xdvdfs
-cargo install xdvdfs-cli
-xdvdfs unpack project_sylpheed.iso ./assets/
-```
-
-### Step 2 — Run the viewer
-
-```bash
-cd sylpheed-viewer
-
-just run          # Native viewer
-just web          # WASM dev server → http://localhost:8080
-```
-
-The asset viewer opens an orbit camera scene. Use the left panel to browse extracted game files. Click a `.xpr` file to preview it as a texture.
-
----
-
-## Build Commands
-
-All commands run from the `sylpheed-viewer/` directory.
-
-```bash
-just run              # Run the native viewer (debug)
-just run-dev          # Run with hot-reloading
-just build-native     # Build native release binary
-just web              # WASM dev server at localhost:8080
-just build-web        # WASM release build → ./dist/
-
-just extract game.iso # Extract an ISO to ./assets/
-just sniff            # Identify file formats in ./assets/
-just sniff-unknown    # Show only unrecognised formats (RE focus)
-
-just test             # Run all tests
-just ci               # Full CI: fmt + lint + test + WASM check
-```
-
----
-
-## Technology Stack
-
-| Layer | Choice | Reason |
-|-------|--------|--------|
-| Language | **Rust** | Memory safety, performance, cross-platform |
-| Game engine | **Bevy 0.15** | ECS-first, WASM-native, data-driven |
-| XISO reading | **xdvdfs** | Pure Rust, reads Xbox 360 disc images |
-| Binary parsing | **binrw** | Derive-macro based, ideal for RE work |
-| Web bundler | **Trunk** | Bevy's standard WASM build tool |
-| CLI | **clap** | Asset extraction and inspection tools |
-| Debug UI | **bevy_egui** | In-viewer asset browser and RE notes panel |
-
----
-
-## Key Architectural Decisions
-
-**`sylpheed-formats` has zero Bevy dependency.** All binary format parsers live here and are testable with plain `cargo test`. Bevy integration is a thin layer on top in `sylpheed-viewer`.
-
-**WASM is a first-class target.** XISO reading is gated behind `#[cfg(not(target_arch = "wasm32"))]` since the browser can't read local files. On the web, assets must be pre-extracted and served over HTTP.
-
-**Modding is designed in from the start.** The virtual filesystem (`vfs.rs`) is the single choke point for all asset reads — a mod loader only needs to intercept that one layer to override any file.
-
----
-
-## Reverse Engineering Notes
-
-### Known file formats
-
-| Path pattern | Format | Status | Notes |
-|---|---|---|---|
-| `*.XPR`, `*.XPR2` | XPR2 texture | ✅ Parsing | DXT1/3/5, DXN, Morton de-tiling done |
-| `DEFAULT.XEX` | Xbox EXE 2 | 🔬 Study | Main executable — load in Ghidra (PPC BE) |
-| `*.XWB`, `*.XSB` | XACT audio | ⏳ TODO | Wave/sound banks; audio is XMA codec |
-| `*.pak`, `*.p00` | SETA archive | ⏳ Unknown | Paired header/data format |
-| mesh files | Unknown | ⏳ TODO | Run `just sniff-unknown` to find candidates |
-
-### RE workflow
-
-```bash
-# 1. Extract and map the disc
-just extract game.iso
-just sniff-unknown   # shows hex magic bytes of unknown files
-
-# 2. Hex-inspect candidates
-#    Groups of 12 bytes at offsets: likely f32 XYZ vertices
-#    Groups of 6 bytes:             likely u16 triangle indices
-
-# 3. Cross-reference in Ghidra
-#    Load DEFAULT.XEX with PowerPC Big-Endian processor
-#    Search string refs to file extensions → find load functions
-
-# 4. Implement parser
-#    Add binrw #[derive(BinRead)] struct in sylpheed-formats/src/mesh.rs
-#    cargo test -p sylpheed-formats
-```
-
-### Next steps (Milestone 2)
-
-1. **Mesh format** — fingerprint with `sniff-unknown`, implement `mesh.rs`
-2. **Audio** — parse XWB headers, batch-convert XMA to WAV via `ffmpeg`
-3. **Mission data** — format unknown; starts after mesh/texture loading works
-4. **Flight model** — document by playing the original; implement as Bevy system
-
----
-
-## Constraints
-
-1. **Never copy decompiled or disassembled game code** — reimplement behavior through observation only.
-2. **Assets stay gitignored** — `assets/` and `*.iso` are excluded. Never commit game files.
-3. **Keep `sylpheed-formats` Bevy-free** — parsers must be testable without a GPU.
-4. **WASM must always compile** — CI enforces `cargo check --target wasm32-unknown-unknown`.
-5. **`justfile` is the source of truth** for build commands — add new recipes there.
-
----
-
-## Milestone Roadmap
-
-| Milestone | Goal | Status |
-|---|---|---|
-| 1 | Asset Explorer | 🚧 In Progress |
-| 2 | Flying Tech Demo | ⏳ Planned |
-| 3 | Combat Prototype | ⏳ Planned |
-| 4 | Mission 1 Playable | ⏳ Planned |
-| 5 | Full Game (all 16 missions) | ⏳ Planned |
-| 6 | Mod SDK | ⏳ Planned |
-
----
-
-## Useful References
-
-- [xdvdfs](https://github.com/antangelo/xdvdfs) — XISO disc image reader (used in this project)
-- [Xenia emulator](https://github.com/xenia-canary/xenia-canary) — GPU/API reference (cloned at `../../xenia-canary/`)
-- [xboxdevwiki](https://xboxdevwiki.net) — Xbox 360 hardware documentation
-- [binrw docs](https://binrw.rs) — binary format parsing framework
-- [Free60 Project](https://free60project.github.io/wiki/) — open Xbox 360 hardware docs
+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.
diff --git a/godot-import/authored/README.md b/authored/README.md
similarity index 100%
rename from godot-import/authored/README.md
rename to authored/README.md
diff --git a/godot-import/authored/flow.json b/authored/flow.json
similarity index 100%
rename from godot-import/authored/flow.json
rename to authored/flow.json
diff --git a/godot-import/authored/screen_names.json b/authored/screen_names.json
similarity index 100%
rename from godot-import/authored/screen_names.json
rename to authored/screen_names.json
diff --git a/godot-import/authored/timing.json b/authored/timing.json
similarity index 100%
rename from godot-import/authored/timing.json
rename to authored/timing.json
diff --git a/godot-import/crates/sylpheed-export/Cargo.toml b/crates/sylpheed-export/Cargo.toml
similarity index 87%
rename from godot-import/crates/sylpheed-export/Cargo.toml
rename to crates/sylpheed-export/Cargo.toml
index 6b08a7a8..a8da7e34 100644
--- a/godot-import/crates/sylpheed-export/Cargo.toml
+++ b/crates/sylpheed-export/Cargo.toml
@@ -49,7 +49,13 @@ license.workspace = true
 # which a capture of the running game plainly shows. 5414db3 is the revision at
 # which that fix carries its disc-wide check (30 of 13 991 elements move, 4
 # become visible, 0 become invisible), not merely the one where it was written.
-sylpheed-formats = { git = "https://git.mc02.dev/fabi/Syplheed-Reborn.git", tag = "formats-pin-2026-08-29" }
+# A PATH dependency now that the decoders and the exporter live in one
+# repository. This deletes a whole class of failure that the two-repo split
+# created: no pinned revision to go stale, no tag to keep alive, no commit that
+# a squash-merge can orphan, and no way for the exporter to be built against a
+# decoder it was never tested with. A decoder change and the exporter change it
+# requires now land in the same commit or not at all.
+sylpheed-formats = { path = "../sylpheed-formats" }
 
 serde      = { version = "1", features = ["derive"] }
 serde_json = "1"
diff --git a/godot-import/crates/sylpheed-export/src/check.rs b/crates/sylpheed-export/src/check.rs
similarity index 100%
rename from godot-import/crates/sylpheed-export/src/check.rs
rename to crates/sylpheed-export/src/check.rs
diff --git a/godot-import/crates/sylpheed-export/src/main.rs b/crates/sylpheed-export/src/main.rs
similarity index 100%
rename from godot-import/crates/sylpheed-export/src/main.rs
rename to crates/sylpheed-export/src/main.rs
diff --git a/godot-import/crates/sylpheed-export/src/screen.rs b/crates/sylpheed-export/src/screen.rs
similarity index 100%
rename from godot-import/crates/sylpheed-export/src/screen.rs
rename to crates/sylpheed-export/src/screen.rs
diff --git a/godot-import/crates/sylpheed-export/src/video.rs b/crates/sylpheed-export/src/video.rs
similarity index 100%
rename from godot-import/crates/sylpheed-export/src/video.rs
rename to crates/sylpheed-export/src/video.rs
diff --git a/data/mods/.gitkeep b/data/mods/.gitkeep
new file mode 100644
index 00000000..e69de29b
diff --git a/godot-import/docker/Dockerfile b/docker/port/Dockerfile
similarity index 100%
rename from godot-import/docker/Dockerfile
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similarity index 100%
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similarity index 100%
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diff --git a/godot-import/docker/sylph-port b/docker/port/sylph-port
similarity index 100%
rename from godot-import/docker/sylph-port
rename to docker/port/sylph-port
diff --git a/docs/game/navigation.md b/docs/game/navigation.md
new file mode 100644
index 00000000..88b19206
--- /dev/null
+++ b/docs/game/navigation.md
@@ -0,0 +1,137 @@
+# How the game is navigated
+
+**Purpose:** so nobody has to rediscover this. Every screen, what reaches it,
+what input it takes, and every modal that can interrupt.
+
+**Status:** skeleton, filled from what the corpus already knows. Most rows are
+❔ and are *meant* to be — this page exists to be completed from the oracle, not
+to look finished.
+
+> ## ⚠️ The oracle is Xenia Canary running the real game
+>
+> Not `sylpheed-cli`, not the viewer, not any renderer of ours. Reborn is a tool
+> for *verifying our decoding*; it is a hypothesis under test and it has been
+> wrong. **Every row below is only as good as the capture behind it**, and a row
+> with no capture is a guess wearing a table cell.
+>
+> This is written here because the mistake has already been made once, by the
+> author of this file, and it propagated into three documents and both agents
+> before a human caught it.
+
+Confidence: ✅ measured from a capture · 🟡 inferred from disc data · ❔ unknown.
+
+## 1. The screen vocabulary ✅
+
+The executable carries its own list — a `.rdata` pointer array at `0x820A1630`,
+29 entries, index = GamePart id, confirmed against the factory-registration
+strings in the image:
+
+```
+ 0 GP_TITLE            10 GP_BUNK             20 GP_STAGE_CLEAR
+ 1 GP_ADVERTISE_DEMO   11 GP_READY_ROOM       21 GP_MISSION_LOG
+ 2 GP_SELECT_STORAGE   12 GP_HANGAR           22 GP_GAMEOVER
+ 3 GP_LOAD             13 GP_ARSENAL          23 GP_DEBRIEFING
+ 4 GP_SAVE             14 GP_PILOT_LOG        24 GP_DIALOG
+ 5 GP_EXTRAS           15 GP_SYSTEM           25 GP_TUTORIAL
+ 6 GP_MOVIE_THEATER    16 GP_DEMO            *26 GP_CHALLENGE
+ 7 GP_MISSION_SELECT   17 GP_MAIN_GAME        27 GP_LEADERBOARD
+ 8 GP_OPTIONS          18 GP_SELECTOR         28 GP_TEST
+ 9 GP_MOVIE            19 GP_PAUSE_MENU
+```
+
+This is the *vocabulary*, not the graph. **Which button reaches which id is
+not decoded** — that is the open question, and filling in §3 is what closes it.
+
+`GP_TEST` is named here and is not on the disc.
+
+## 2. Boot 🟡
+
+```
+developer logo splash  →  intro video  →  title / PRESS Ⓐ  →  main menu
+```
+
+* The splash is a **screen, not a video** ✅ — `logo1`–`logo4` are bound by the
+  movie manifest and have no `.wmv` on the disc.
+* The intro is `dat/movie/ADV.wmv` ✅.
+* ❔ What *drives* the order. It is observable; the data or code behind it is not
+  decoded.
+* ⚠️ **Two title states exist and look identical.** The title that ends the boot
+  accepts a single Ⓐ; the title the attract loop returns to accepts nothing —
+  Ⓐ, START, B, BACK, X, Y all ignored across dozens of delivered presses. They
+  draw **13 identical quads**, so they differ only to the guest. Capture the
+  first title after boot; do not tap during the boot.
+
+## 3. Screens
+
+One section per screen. Fill from a capture, and cite it.
+
+### GP_TITLE — main menu 🟡
+
+Five buttons, `ptbtn01`–`ptbtn05`, at x=542, y=162/242/322/401/482.
+
+| button | label | reaches | confidence |
+|---|---|---|---|
+| `ptbtn01` | ❔ | ❔ | |
+| `ptbtn02` | ❔ | ❔ | |
+| `ptbtn03` | ❔ | ❔ | |
+| `ptbtn04` | ❔ | ❔ | |
+| `ptbtn05` | ❔ | ❔ | |
+
+Labels are baked into the sprites — a human reads them in a minute, but **no
+decoded field says which GamePart a button opens.** If the labels are read by
+eye, say so; that is an authored mapping, not a disc fact.
+
+❔ Initial focus · ❔ wrap-around at the ends · ❔ whether left/right does
+anything · ❔ what B does.
+
+### GP_LOAD ❔ · GP_SAVE ❔ · GP_EXTRAS ❔ · GP_OPTIONS ❔ · GP_MISSION_SELECT ❔
+
+❔ Not documented. Known fragment: the path
+`title → LOAD GAME → slot 01 → YES → READY ROOM → TAKE OFF` reaches flight, and
+**stage select would not move** — 16 d-pad presses never left Stage 01.
+
+### GP_READY_ROOM ❔
+
+The largest UI archive on the disc; only 6 of 1 106 names resolve, and it is
+ISL-scripted. A probe found the pak holds briefing/tactical-map content rather
+than the Ready Room menu itself. Out of scope for the menu milestone.
+
+## 4. Modals, prompts and alerts
+
+The interrupting layer, and the one most likely to break a scripted run.
+
+| modal | seen at | default focus | notes |
+|---|---|---|---|
+| `Save game?` | after a mission | **YES** ✅ | cursor starts on YES |
+| `Do you want to develop this weapon?` | Arsenal | ❔ | |
+| ❔ overwrite / delete confirmations | Save/Load | ❔ | |
+| ❔ error and "not enough points" alerts | Arsenal | ❔ | |
+
+⚠️ **A 60 ms d-pad tap is ignored inside a dialog.** It moves the cursor on a
+menu and does nothing in a modal, so a script that works on menus silently picks
+the default in every prompt. Confirm which side the cursor is on before Ⓐ.
+
+## 5. In-game flight ❔
+
+Not started. **The in-game tutorials are the resource** — they teach the control
+scheme in the game's own words, which is exactly the documentation we want, and
+they are `S18`–`S23` on disc.
+
+To fill in: the control map (both stick modes if there are two), throttle,
+target select — Ⓐ pressed **twice**, not once, which a sweep that only ever
+tapped once "proved" did not exist — weapon cycling, the pause menu, and the
+HUD's readouts.
+
+## 6. Input traps, all measured ✅
+
+Real behaviours that read as bugs:
+
+* **F10 opens the emulator menu bar**, and any Xenia UI makes
+  `XamInputGetKeystrokeEx` return SUCCESS with an empty keystroke *before* any
+  driver is asked. The pad looks dead and is not.
+* **A signed-in profile is required** — hence `--create_profile_if_none`.
+* **A FIFO trace consumer that exits stalls the emulator**, which also reads as
+  a dead pad.
+* **The title is not input-ready for ~10 s** after it appears.
+* **Ⓐ on the first title succeeds about half the time**, and nothing measurable
+  predicts which. Five explanations have been eliminated. Budget retries.
diff --git a/godot-import/docs/AUDIO-VERIFICATION.md b/docs/port/AUDIO-VERIFICATION.md
similarity index 100%
rename from godot-import/docs/AUDIO-VERIFICATION.md
rename to docs/port/AUDIO-VERIFICATION.md
diff --git a/godot-import/docs/BLOCKED.md b/docs/port/BLOCKED.md
similarity index 100%
rename from godot-import/docs/BLOCKED.md
rename to docs/port/BLOCKED.md
diff --git a/godot-import/docs/DECISIONS.md b/docs/port/DECISIONS.md
similarity index 100%
rename from godot-import/docs/DECISIONS.md
rename to docs/port/DECISIONS.md
diff --git a/godot-import/docs/FORMAT.md b/docs/port/FORMAT.md
similarity index 100%
rename from godot-import/docs/FORMAT.md
rename to docs/port/FORMAT.md
diff --git a/docs/port/MODDING.md b/docs/port/MODDING.md
new file mode 100644
index 00000000..5f438ec3
--- /dev/null
+++ b/docs/port/MODDING.md
@@ -0,0 +1,86 @@
+# Modding is a requirement, not a later feature
+
+The port has two goals, and the second one constrains the first: **the exported
+asset tree is a product**, not a build artefact. Someone who has never read this
+repository should be able to open the tree, understand what they are looking at,
+change something, and see it in the game.
+
+That is a design constraint on the **exporter**, today — not a milestone to add
+later. Custom *behaviour* (scripting) is a later milestone, but nothing built now
+may make it harder.
+
+## The five rules
+
+**1. One logical asset, one file. Never split.**
+
+A sprite is one PNG. A track is one OGG. A screen is one JSON. This is a real
+constraint and not a platitude, because **the disc does the opposite everywhere**:
+a `.pak` entry spans segment files, a bank holds several sub-waves, and a
+cutscene voice is a byte region of a continuous stream chunked across entries
+whose boundaries do not match the cues. All of that is the *exporter's* problem
+to resolve. If a modder has to reassemble anything, the export is unfinished.
+
+**2. Names a person recognises.**
+
+`screens/title/main_menu.json`, not `0x90822a39.json`. Where the disc's own name
+was never recovered — the six `*2D` archives, `GP_READY_ROOM` — emit a stable
+synthetic name **and say in the file that the real one is unknown**, so a modder
+can tell a recovered name from an invented one.
+
+**3. Modern, editable formats only.**
+
+| kind | format | why |
+|---|---|---|
+| data, layout, config | **JSON** | Godot parses it natively (`JSON.parse_string`); every tool speaks it |
+| images | **PNG** | RGBA8, lossless, opens anywhere |
+| audio | **Ogg Vorbis** | Godot-native, no licence trap |
+| video | **Ogg Theora** | the only format Godot 4 plays natively |
+| text | **UTF-8** | never UTF-16BE, whatever the disc did |
+
+Not XML: Godot's `XMLParser` is a SAX-style API needing a hand-written binding
+per schema, where JSON is one call. Not a custom binary container, ever — that
+would rebuild the exact wall this port exists to remove.
+
+**4. Base and overrides, never one merged pile.**
+
+```
+data/
+  base/     generated from your disc by the exporter. Gitignored. Rewritten
+            wholesale -- never hand-edit it, your changes will vanish.
+  mods/     drop-in overrides. Yours. The exporter never touches this.
+```
+
+A mod replaces a file by shadowing its path. A modder edits nothing under
+`base/`, so re-exporting is always safe, and "did I break it?" is answered by
+disabling a mod rather than by re-extracting the disc.
+
+**5. Provenance in every generated file.**
+
+Source archive, entry index, exporter version. It is what lets someone check a
+file against the disc instead of trusting it — and what stops the export drifting
+into an unverifiable fork of the original.
+
+## Not blocking scripted mods later
+
+Behaviour modding is a later milestone. Two decisions now keep the door open:
+
+* **The loader is data-driven and screen-agnostic.** No screen name is hardcoded
+  in GDScript. A screen is *whatever the JSON describes*, so a mod that adds a
+  new screen needs no engine change.
+* **No GDExtension, no native code in `port/`.** [Godot Mod Loader][gml] — the
+  established option, Godot 4.1–4.3, used by Brotato and Dome Keeper — works by
+  substituting **GDScript** at load time. A port whose logic lives in GDScript
+  stays moddable by it; one that hides logic in native code does not.
+
+Adopting a mod loader is a decision for that milestone. Making it *possible* is a
+constraint on this one.
+
+[gml]: https://github.com/GodotModding/godot-mod-loader
+
+## What this rules out, explicitly
+
+* Atlases or packed archives of sprites — one file per sprite.
+* Any format needing our code to read it.
+* Hash-named files.
+* Hand-edited files under `data/base/`.
+* Splitting one playable thing across files to mirror how the disc stored it.
diff --git a/godot-import/docs/MISSION.md b/docs/port/PORT-MISSION.md
similarity index 100%
rename from godot-import/docs/MISSION.md
rename to docs/port/PORT-MISSION.md
diff --git a/godot-import/docs/loop-task.md b/docs/port/port-loop-task.md
similarity index 100%
rename from godot-import/docs/loop-task.md
rename to docs/port/port-loop-task.md
diff --git a/godot-import/.gitignore b/godot-import/.gitignore
deleted file mode 100644
index 11bc8073..00000000
--- a/godot-import/.gitignore
+++ /dev/null
@@ -1,12 +0,0 @@
-# Generated from the user's own disc. This repo stays clean-room: code,
-# schemas, authored mappings and docs only -- never game assets.
-/export/
-
-# Rust
-/target/
-**/*.rs.bk
-
-# Godot
-.godot/
-/port/.godot/
-*.import
diff --git a/godot-import/Cargo.lock b/godot-import/Cargo.lock
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diff --git a/godot-import/Cargo.toml b/godot-import/Cargo.toml
deleted file mode 100644
index 3d3d1ec1..00000000
--- a/godot-import/Cargo.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[workspace]
-resolver = "2"
-members = ["crates/sylpheed-export"]
-
-[workspace.package]
-version = "0.1.0"
-edition = "2021"
-license = "MIT"
diff --git a/godot-import/README.md b/godot-import/README.md
deleted file mode 100644
index 9f847044..00000000
--- a/godot-import/README.md
+++ /dev/null
@@ -1,75 +0,0 @@
-# Sylpheed Godot
-
-A clean-room Godot 4 port of *Project Sylpheed: Arc of Deception*, starting with
-the menu shell: developer splash → intro video → title → main menu → submenus.
-
-**You need your own copy of the game.** Nothing in this repository is game
-content. An offline exporter reads the disc you supply and writes an open,
-moddable asset tree; the Godot project reads only that tree and never touches a
-disc format.
-
-```
-  your disc  ──▶  crates/sylpheed-export  ──▶  export/   ──▶  port/  (Godot 4)
-                  (Rust; decoders come from      JSON + PNG        reads ONLY
-                   sylpheed-formats)             + OGG + OGV       open formats
-```
-
-## Why the wall
-
-Two reasons, and the second is the interesting one:
-
-1. Godot cannot read IPFB archives, RATC bundles, T8aD textures, XMA banks or
-   WMV video, and it should not learn to.
-2. **Modding is a goal of this port.** If the runtime reads the original formats,
-   modding means reverse engineering. If it reads JSON and PNG, modding means
-   opening a file.
-
-## Where the knowledge comes from
-
-The decoders live in [`sylpheed-formats`][formats], pinned by revision — a
-separate project, where the reverse engineering happens. Its
-`docs/port/HANDOFF.md` is the contract: what has been decoded, what was measured
-off the running game, and what is known to be undecodable. Read it before
-assuming a value is on the disc.
-
-[formats]: https://git.mc02.dev/fabi/Syplheed-Reborn
-
-## Layout
-
-| | |
-|---|---|
-| `crates/sylpheed-export/` | disc → open formats. Regenerates `export/` wholesale |
-| `port/` | the Godot 4 project |
-| `authored/` | decisions that are **not** on the disc, each with its reason |
-| `export/` | generated, gitignored, never hand-edited |
-| `tools/` | verification harnesses that hold the port to the reference renderer |
-| `docs/` | the mission, the format spec, the agent's loop prompt |
-
-## Verifying
-
-**The oracle is the Xenia Canary capture and the game**, not either renderer.
-`sylpheed-cli screen render` is an explorer and extraction CLI for verifying
-decodes, and it can be wrong -- three times both it and the port agreed and both
-were wrong, each caught only by a capture.
-
-So `tools/verify-screen` is a **consistency check and a regression detector**,
-not a grade. It draws every exported screen both ways -- built from the same
-`sylpheed-formats` revision the exporter is pinned to -- and reports the largest
-per-channel difference in the frame:
-
-```
-tools/verify-screen              # every screen in the manifest
-tools/verify-screen main_menu    # one of them
-```
-
-A difference means the two moved apart; `docs/DECISIONS.md` says which one moved
-and why, rather than tuning the port until the number goes down. Correctness is
-checked against the captures indexed at `docs/re/captures/ORACLE-CAPTURES.md` --
-mind that they are not gamma-neutral, so RMSE against them has a floor.
-
-## Status
-
-**P1.** The exporter writes `GP_TITLE`'s twelve screen builds and their sprites,
-and the Godot project draws any of them statically at 1280x720 from that tree
-alone. `main_menu` matches the reference renderer to within 3/255 on every
-channel of every pixel. Next: P2, keyframe animation.
diff --git a/godot-import/port/project.godot b/port/project.godot
similarity index 100%
rename from godot-import/port/project.godot
rename to port/project.godot
diff --git a/godot-import/port/scenes/boot.tscn b/port/scenes/boot.tscn
similarity index 100%
rename from godot-import/port/scenes/boot.tscn
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diff --git a/godot-import/port/scripts/boot.gd b/port/scripts/boot.gd
similarity index 100%
rename from godot-import/port/scripts/boot.gd
rename to port/scripts/boot.gd
diff --git a/godot-import/port/scripts/boot.gd.uid b/port/scripts/boot.gd.uid
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diff --git a/godot-import/port/scripts/export_tree.gd b/port/scripts/export_tree.gd
similarity index 100%
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diff --git a/godot-import/port/scripts/export_tree.gd.uid b/port/scripts/export_tree.gd.uid
similarity index 100%
rename from godot-import/port/scripts/export_tree.gd.uid
rename to port/scripts/export_tree.gd.uid
diff --git a/godot-import/port/scripts/screen_view.gd b/port/scripts/screen_view.gd
similarity index 100%
rename from godot-import/port/scripts/screen_view.gd
rename to port/scripts/screen_view.gd
diff --git a/godot-import/port/scripts/screen_view.gd.uid b/port/scripts/screen_view.gd.uid
similarity index 100%
rename from godot-import/port/scripts/screen_view.gd.uid
rename to port/scripts/screen_view.gd.uid
diff --git a/godot-import/tools/screen-strip b/tools/port/screen-strip
similarity index 100%
rename from godot-import/tools/screen-strip
rename to tools/port/screen-strip
diff --git a/godot-import/tools/verify-screen b/tools/port/verify-screen
similarity index 100%
rename from godot-import/tools/verify-screen
rename to tools/port/verify-screen
diff --git a/godot-import/tools/verify-video-audio b/tools/port/verify-video-audio
similarity index 100%
rename from godot-import/tools/verify-video-audio
rename to tools/port/verify-video-audio