chore: delete every Forge handoff from builds - Windows test steps and results live on the engine wiki page that owns the feature; README and master plan point there

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018hSLRwirUk2NF4j1v2kH4Z

.agents/wiki/master-plan.md

@@ -7,12 +7,10 @@ Tinqs/Ariki stack, plus `manifest.json` tracking exact shipped versions. Source
 `tinqs/engine`, `tinqs/ariki-game`, `tinqs/ariki-sim` — this repo only holds built output.
 
 - macOS arm64: engine 4.7, native Terrain3D module, GodotSharp shipped.
-- Windows x64: engine 4.6.5 (pre-4.7), GDExtension Terrain3D, 4.7 upgrade pending Forge —
-  see `.agents/handoffs/forge-windows-4.7.md`.
+- Windows x64: engine 4.7, built on Forge, GodotSharp shipped.
 
 ## In flight
 
-- Windows 4.7 engine build + matching GodotSharp (blocked on Forge machine — see handoff).
 - Longer-term: CI (Gitea Actions) building on push and publishing here / to S3 — tracked in
   `docs/ai/plans/build-pipeline-architecture-2026-06-07.md` (hub repo, not here).