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/skills/update-engine/SKILL.md

@@ -1,89 +0,0 @@
----
-name: update-engine
-description: Install/update the local Tinqs engine (binary + GodotSharp C# bindings) from this builds repo so ariki-game runs on the current engine. Use when an engine update is announced, when setting up a new machine, or when the game shows ".NET assemblies not found" or "Wrapper class not found for type: Terrain3D" (terrain is water / animals don't animate). Covers macOS (arm64) and Windows (x64).
----
-
-# Update the Tinqs engine from `builds`
-
-**Only Ozan edits the engine source.** Everyone else installs the prebuilt engine from this
-repo into `../engine/bin/`, which is where `ariki-game` looks for it.
-
-## ⚠️ Read this first — binary + GodotSharp are a MATCHED PAIR
-
-The engine binary and its `GodotSharp/` folder (Godot's C# bindings) are **both generated from the
-same engine source** and must be installed **together**. The binary does **not** regenerate
-`GodotSharp` — it must sit next to the binary on disk. Mismatch symptoms:
-
-| Symptom | Cause |
-|---|---|
-| `.NET assemblies not found` dialog (looks for `engine/bin/GodotSharp/Api/Debug`) | no `GodotSharp` present |
-| `Wrapper class not found for type: Terrain3D` / `MultiSkinnedMeshInstance3D` — terrain renders as water, animals don't animate | **stale** `GodotSharp` from an older engine that predates the built-in Terrain3D / agent_skinned modules |
-
-So: always **replace `GodotSharp` wholesale** when you take a new binary, and clear the game's C#
-cache so it rebuilds against the new bindings.
-
-## Assumed layout
-
-```
-tinqs-ltd/
-  ariki-game/    ← the game  (looks for ../engine/bin/…)
-  engine/bin/    ← install target: binary + GodotSharp live here
-  builds/        ← this repo (prebuilt engine)
-```
-Adjust paths below if your checkout differs.
-
-## 1. Pull the latest build
-
-```bash
-cd <…>/builds
-tinqs pull          # never `git pull` — tinqs handles LFS (the binary + GodotSharp are LFS)
-```
-Check `builds/manifest.json` for the current version/commit per platform.
-
-## 2a. Install — macOS (arm64)
-
-```bash
-BUILDS="<…>/builds"; ENGINE="<…>/engine/bin"; GAME="<…>/ariki-game"
-mkdir -p "$ENGINE"
-# 1) binary
-cp "$BUILDS/engine/macos-arm64/tinqs.macos.editor.arm64.mono" "$ENGINE/"
-chmod +x "$ENGINE/tinqs.macos.editor.arm64.mono"
-# 2) GodotSharp — REPLACE wholesale (matched pair)
-rm -rf "$ENGINE/GodotSharp"
-cp -R "$BUILDS/engine/macos-arm64/GodotSharp" "$ENGINE/GodotSharp"
-# 3) clear the game's stale C# cache
-rm -rf "$GAME/.godot/mono"
-```
-
-## 2b. Install — Windows (x64), PowerShell
-
-```powershell
-$builds="<…>\builds"; $engine="<…>\engine\bin"; $game="<…>\ariki-game"
-New-Item -ItemType Directory -Force -Path $engine | Out-Null
-# 1) binaries
-Copy-Item "$builds\engine\windows-x64\tinqs.windows.editor.x86_64.mono.exe" $engine -Force
-Copy-Item "$builds\engine\windows-x64\tinqs.windows.editor.x86_64.mono.console.exe" $engine -Force
-# 2) GodotSharp — REPLACE wholesale (matched pair)
-Remove-Item -Recurse -Force "$engine\GodotSharp" -ErrorAction SilentlyContinue
-Copy-Item -Recurse "$builds\engine\windows-x64\GodotSharp" "$engine\GodotSharp"
-# 3) clear the game's stale C# cache
-Remove-Item -Recurse -Force "$game\.godot\mono" -ErrorAction SilentlyContinue
-```
-
-## 3. Verify
-
-```bash
-"$ENGINE/tinqs.macos.editor.arm64.mono" --version          # matches manifest.json
-ls "$ENGINE/GodotSharp/Api/Debug/GodotSharp.dll"            # MUST exist
-```
-Then run the game (`cd ariki-game && bash tools/game.sh run`). Healthy = terrain renders, animals
-animate, log shows **0** `Wrapper class not found` and no `.NET assemblies not found` dialog.
-
-## Notes
-
-- **GodotSharp must be present in this repo for the copy to work.** If `builds/engine/<platform>/GodotSharp`
-  is missing, the build owner needs to add it (it ships *with* the binary — see `manifest.json`).
-- Don't mix a new binary with an old `GodotSharp`. Always replace both, together.
-- Terrain3D and the skinned-animation classes are **built into the engine binary** now (no separate
-  `addons/terrain_3d` GDExtension `.framework`). If you still have `addons/terrain_3d/terrain.gdextension`
-  or the macOS `.framework`, remove them — they conflict with the built-in module.

README.md

@@ -8,9 +8,10 @@ Build artifacts for the Tinqs stack — engine editor binaries (+ their GodotSha
 
 ## Installing / updating the engine
 
-**Don't copy files by hand — run the skill:** [`.agents/skills/update-engine`](.agents/skills/update-engine/SKILL.md).
-Hand it to your agent; it installs the binary + GodotSharp into `../engine/bin/`, wipes stale
-caches, and verifies. Covers macOS + Windows.
+**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