Refine NPC fabric UVs and remove baked AO blotches

docs/blender-assets.md

@@ -91,7 +91,9 @@ All eight use the `npc_base` contract, so each one can replace
   animation proxies in `_build_skinned_body()` stay valid.
 - material slots `skin`, `cloth`, `pants`, `accessory`, `hair` carry the same
   neutral `assets/textures/npc/<slot>_{albedo,normal}.png` maps at 256², so
-  `Materials.npc_slot()` tints them the same way it tints `npc_base`.
+  `Materials.npc_slot()` tints them the same way it tints `npc_base`. Cloth and
+  pants repeat the weave 4× (`NPC_FABRIC_UV_SCALE`) and intentionally skip the
+  per-character baked AO; skin, hair and fixed gear keep it.
 - budget ≤ **8,000 triangles and ≤ 8,000 glTF vertices** for the eight library
   variants (vertex count after seam splits; `CHAR_MAX_TRIS`/`CHAR_MAX_VERTS` in
   `tools/blender_assets.py`, raised from 6,000/5,000 on 2026-11-02). The frozen