move update-engine skill to game repo (everyone has ariki-game, not engine); point README/manifest there

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.agents/handoffs/forge-windows-4.7.md

@@ -0,0 +1,62 @@
+# Handoff → Forge (Ozan's Windows box): build Windows 4.7 + ship GodotSharp
+
+**Date:** 2026-06-19 · **From:** macOS 4.7 native-module migration · **For:** Windows build owner
+
+## Why
+
+The engine moved to **Godot 4.7** and **Terrain3D + agent_skinned are now native engine modules**
+(compiled into the binary — no GDExtension `.framework`). macOS is done and shipped in this repo
+(`engine/macos-arm64/`). **Windows is still 4.6.5 with the GDExtension** and must be brought up to
+4.7 the same way, or Windows teammates can't run the new `ariki-game` (the game-side cutover removed
+the terrain GDExtension).
+
+## The critical bit (don't skip)
+
+After the 4.7 build you **must regenerate GodotSharp and ship it next to the binary.** A native
+module changes the engine's class list; the C# bindings (`GodotSharp`) must be regenerated to
+include `Terrain3D` / `MultiSkinnedMeshInstance3D`, or the game throws
+`Wrapper class not found for type: Terrain3D` (terrain = water, animals frozen). The engine does
+**not** regenerate GodotSharp at runtime.
+
+## Steps (Windows)
+
+1. **Sync engine source** to the current `tinqs/engine` `main` (single 4.7 snapshot, `4ba7b5b`).
+   ```
+   cd engine
+   tinqs pull            # or: git fetch origin && git checkout main && git reset --hard origin/main
+   ```
+2. **Build the editor**:
+   ```
+   scons platform=windows target=editor arch=x86_64 module_mono_enabled=yes
+   scons platform=windows target=editor arch=x86_64 module_mono_enabled=yes windows_subsystem=console   # console binary
+   ```
+3. **Regenerate the mono glue + GodotSharp assemblies** (this is the step that fixes the wrapper errors):
+   ```
+   bin\tinqs.windows.editor.x86_64.mono.exe --headless --generate-mono-glue modules\mono\glue
+   python modules\mono\build_scripts\build_assemblies.py --godot-output-dir=bin --godot-platform=windows
+   ```
+   Confirm `bin\GodotSharp\Api\Debug\GodotSharp.dll` exists and that
+   `modules\mono\glue\...\Generated\Constructors.cs` contains `Terrain3D` (grep it).
+4. **If you hit the same build errors I did** (already fixed in `main`, but for reference): a core
+   module can't expose an editor-API type — `Terrain3D::set_plugin` must take `Object*` not
+   `EditorPlugin*`; `Terrain3DAssetResource` must be `GDREGISTER_ABSTRACT_CLASS`; drop the redundant
+   `Terrain3DRegion::duplicate` bind. These are already in `main` — a clean pull should have them.
+5. **Drop into this builds repo** (`engine/windows-x64/`):
+   - `tinqs.windows.editor.x86_64.mono.exe` (+ `.console.exe`)
+   - the whole `GodotSharp/` folder  ← **new requirement; was previously .gitignored**
+6. **Update `manifest.json`** windows-x64 block: version `4.7…`, `engine_commit` `4ba7b5b`, new
+   sha256s, add `"godotsharp": "engine/windows-x64/GodotSharp"`, clear the "pending" note.
+7. `tinqs push`.
+
+## Verify
+
+On a Windows machine with `ariki-game`: run the update-engine skill (`.agents/skills/update-engine`,
+Windows path), launch `game.sh run`. Healthy = terrain renders, animals animate, **0**
+`Wrapper class not found`, no `.NET assemblies not found`.
+
+## Notes
+
+- `.gitattributes` already LFS-tracks `engine/**`, so the binary + GodotSharp go to LFS automatically.
+- The macOS side in this repo is the reference for exactly what the layout should look like.
+- Game-side cutover (GDExtension removal, `project.godot`→4.7) is committed on `ariki-game` `main`
+  (held pending team sync) — Windows teammates need this engine before that lands for them.

.gitignore

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+# GodotSharp (the engine's C# bindings) IS now tracked and shipped alongside each binary.
+# It is a matched pair with the binary — see README.md / .agents/skills/update-engine.
+# (Previously windows-x64/GodotSharp was ignored; that was wrong — teammates need it.)

README.md

@@ -1,11 +1,41 @@
 # tinqs/builds
 
-Build artifacts for the Tinqs stack — engine editor binaries and game exports.
+Build artifacts for the Tinqs stack — engine editor binaries (+ their GodotSharp C# bindings).
-**Binaries are stored via Git LFS** (see `.gitattributes`). Source lives in `tinqs/engine`,
+**Binaries and GodotSharp are stored via Git LFS** (see `.gitattributes`). Source lives in
-`tinqs/ariki-game`, `tinqs/ariki-sim`. See `manifest.json` for what's here.
+`tinqs/engine`, `tinqs/ariki-game`, `tinqs/ariki-sim`. See `manifest.json` for exact versions.
 
-Long-term plan: CI (Gitea Actions) builds on push and publishes here / to S3 — see
+> **Use `tinqs pull` / `tinqs push`, never raw git** — these are LFS-heavy.
-`docs/ai/plans/build-pipeline-architecture-2026-06-07.md`.
+
+## Installing / updating the engine
+
+**Don't copy files by hand — run the `update-engine` skill (it lives in the game repo, which everyone has):**
+[tinqs.com/tinqs/ariki-game · .agents/skills/update-engine](https://tinqs.com/tinqs/ariki-game/src/branch/main/.agents/skills/update-engine/SKILL.md).
+Hand it to your agent; it `tinqs pull`s ariki-game + builds, installs the binary + GodotSharp into
+`../engine/bin/`, wipes stale caches, and verifies. Covers macOS + Windows.
+
+## ⚠️ The one rule: binary + GodotSharp are a MATCHED PAIR
+
+Each engine binary ships with a `GodotSharp/` folder (Godot's C# bindings) **generated from that
+exact engine build**. You must install them **together** and replace any old `GodotSharp`.
+
+- The engine does **NOT** regenerate GodotSharp at runtime. If it's missing you get a
+  **`.NET assemblies not found`** dialog pointing at `engine/bin/GodotSharp/Api/Debug`.
+- A **stale** GodotSharp (from an older engine) against a newer binary throws
+  **`Wrapper class not found for type: Terrain3D`** → terrain renders as water, animals don't animate.
+
+This matters now because **Terrain3D and `agent_skinned` are native engine modules** (no separate
+`addons/terrain_3d` GDExtension `.framework`). Built-in module classes need their wrappers baked
+into GodotSharp, so GodotSharp had to be regenerated — and must ship here alongside the binary.
 
 ## Current contents
-- `engine/macos-arm64/tinqs.macos.editor.arm64.mono` — Godot 4.6.3 fork editor (mono), built on Kraken with Xcode 26.3.
+
+| Platform | Engine | Terrain3D | GodotSharp shipped? |
+|---|---|---|---|
+| `engine/macos-arm64/` | **4.7** (`4ba7b5b`) — native modules | built-in module | ✅ yes (`GodotSharp/`) |
+| `engine/windows-x64/`  | **4.6.5** (`420e74bf8`) — still GDExtension | GDExtension | ❌ pending — see handoff |
+
+**Windows is not yet on 4.7.** The 4.7 Windows build + its GodotSharp must come from Forge —
+see [`.agents/handoffs/forge-windows-4.7.md`](.agents/handoffs/forge-windows-4.7.md).
+
+Long-term: CI (Gitea Actions) builds on push and publishes here / to S3 —
+`docs/ai/plans/build-pipeline-architecture-2026-06-07.md`.