Build and document the canonical quaternius_base.glb (welded, skinned, 62-joint, 1.81m)

TODO.md

@@ -58,8 +58,11 @@ baseline sheet.
       Decided: the three full GLBs are the canonical-base + silhouette-gate scope. They cover
       ~3 of 12 roles (casual, hood, vest); jacket/coat/dress/responder/guard need the 21-part
       modular builder or new clothing at §4. Recorded in `docs/npc-model-sourcing.md`.
-- [ ] Build a canonical `quaternius_base.glb`: one welded, triangulated, grounded 1.81 m
+- [x] Build a canonical `quaternius_base.glb`: one welded, triangulated, grounded 1.81 m
       humanoid with front on Blender −Y, no animation, and a documented bone/part inventory.
+      Built from `Casual_Hoodie.glb` via `tmp/npc-research/build_quaternius_base.py`: one `npc_base`
+      mesh (3,199 welded verts / 6,206 tris), 62 joints, skinned, 1.81 m grounded, T-pose, no
+      clips, `inspect` clean. Inventory in `docs/npc-model-sourcing.md` §Canonical base.
 
 ### 2. Contract bake and animation