engine(windows-x64): fec9847 — spring-bone collision fix + lateral coupling

Match the Kraken macos-arm64 drop: same engine commit, regenerated GodotSharp (lateral_coupling), Planet-Dot splash baked in.

README.md

@@ -31,11 +31,10 @@ into GodotSharp, so GodotSharp had to be regenerated — and must ship here alon
 
 | 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 |
+| `engine/macos-arm64/` | **4.7** (`fec9847`) — native modules | built-in module | ✅ yes (`GodotSharp/`) |
+| `engine/windows-x64/`  | **4.7** (`fec9847`) — native modules | built-in module | ✅ yes (`GodotSharp/`) |
 
-**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).
+Both platforms are on engine `fec9847` (spring-bone collision fix + lateral coupling + Planet-Dot splash). Check `manifest.json` for sha256. The 4.7 Windows cutover handoff is resolved: [`.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`.