Move generalized game asset tooling tasks from TODO.md to DONE.md

TODO.md

@@ -34,11 +34,3 @@ performance hardening only.
 - [ ] Profile the crowd: ensure textured materials and props hold target frame rate around a
       busy entrance.
 - [ ] Add LOD or culling for distant NPCs/props if the crowd grows.
-
-## Generalized Game Asset Tooling
-
-- [ ] Reuse the OpenRouter image backend for role-aware arbitrary asset generation.
-- [ ] Add exact-dimension image crop and aspect-preserving resize commands.
-- [ ] Audit existing assets for role-specific dimensions, aspect, alpha, and tile seams;
-      report projection/perspective checks for visual review.
-- [ ] Add automated tests and document asset-pipeline usage.