Rebuild the NPC hands and add a hand capture

docs/blender-assets.md

@@ -94,8 +94,8 @@ All eight use the `npc_base` contract, so each one can replace
   `Materials.npc_slot()` tints them the same way it tints `npc_base`.
 - budget ≤ 6000 triangles and ≤ 5000 vertices (glTF vertex count, after seam
   splits; `CHAR_MAX_VERTS` in `tools/blender_assets.py`, raised from 4000 for
-  the 2026-11-01 face/hand pass). The current range is 3,762–4,754 triangles
-  and 3,474–4,584 vertices.
+  the 2026-11-01 face/hand pass). The current range is 4,042–5,034 triangles
+  and 3,894–4,948 vertices. The vertex cap is now the tighter budget.
 
 Construction: the torso and limbs are one continuous Skin-modifier mesh,
 subdivided twice, decimated to 26 % with X symmetry, and cut at the waist, cuffs,