Refine NPC fabric UVs and remove baked AO blotches

docs/asset-tooling.md

@@ -106,7 +106,9 @@ python3 tools/npc_pipeline.py palette
 `prepare` resizes the AI fabric tiles (kept locally in `assets/textures/npc/ai/`,
 which is gitignored) onto the 256² `cloth`/`pants` albedos; `build` bakes them into
 the `.glb` and regenerates the procedural normal + packed ORM maps at the same
-256² size. `palette` writes
+256² size. Runtime fabric materials repeat the weave 4× (`NPC_FABRIC_UV_SCALE`)
+and skip the per-character baked AO, which otherwise magnified into large
+blotches; skin, hair and fixed gear keep AO. `palette` writes
 `assets/textures/npc/palette.json` using `model_pipeline.dominant_colors`.
 
 ## Blender asset library (loaded by the game)