Author the 62-to-13 joint map and align the AGENTS.md contract with the Quaternius base

TODO.md

@@ -66,7 +66,7 @@ baseline sheet.
 
 ### 2. Contract bake and animation
 
-- [ ] Author the 62-joint → 13-core joint map, including optional finger/face extras if
+- [-] Author the 62-joint → 13-core joint map, including optional finger/face extras if
       they survive within 24,000 vertices; record it in `docs/npc-model-sourcing.md`.
 - [ ] Bake the rest pose and proportion warp to the contract hip, knee, shoulder, elbow,
       wrist and head positions. Measure the warp at every joint and record the silhouette