Record the Quaternius pose-sync finding (swing axis needs per-bone calibration)

TODO.md

@@ -80,10 +80,14 @@ baseline sheet.
       leg ×0.74, torso ×1.61, hip −0.249, shoulder +0.122. Vision-judged as distorted
       (paddle hands, lost forearms, stretched shins). **Gate fails — Stage 2 (62-joint runtime
       ADR) indicated; do not rebuild on the warped base.**
-- [ ] Skin the Quaternius mesh and verify Idle, Walk, seated and arm-down poses. The old
+- [-] Skin the Quaternius mesh and verify Idle, Walk, seated and arm-down poses. The old
       MPFB/arm-retarget warps are not a reference; judge the Quaternius result directly.
-      (Direction set: ADR-0018 option 2 — 62-joint runtime. The mesh stays at source LOD;
-      arm-down rest pose already baked. Idle/Walk play directly on the 62-joint rig.)
+      (Direction set: ADR-0018 option 2 — 62-joint runtime. `NpcAvatar` now maps the Quaternius
+      names with old-rig fallback and derives proxy pivots from `get_bone_global_rest`
+      (commit `0cd12af`). First end-to-end capture loads and runs, but the vision judge reads
+      the arms/legs as misaligned — the `_sync_skeleton` swing axis (`Vector3.RIGHT`) is
+      calibrated for the old rig, not the Quaternius bone roll. Next: determine the per-bone
+      swing axis for UpperArm/LowerArm/UpperLeg/LowerLeg from the Quaternius rest basis.)
 - [ ] Retarget Idle and Walk from the 24 Quaternius clips to the contract rig; discard
       combat, gun and sword clips. Verify looping, foot contact and frame rate in Godot.
       (Direction set: no retarget needed — the clips are authored for the 62-joint rig; only