Accept ADR-0018 option 2: adopt the Quaternius 62-joint rig at runtime

MEMORY.md

@@ -82,6 +82,13 @@ canonical implemented-features list in `docs/development-status.md`.
   reduction. The canonical base is only 3,199 verts / 6,206 tris, far under the 24,000 cap, so
   there is no budget reason to decimate before the silhouette gate. Do not reuse the old
   7,000-triangle or MPFB decimation targets.
+- **Quaternius runtime rig (2026-11-05, owner, ADR-0018 option 2):** the Stage 1 proportion warp
+  failed the silhouette gate (arm ×1.63 / leg ×0.74 / torso ×1.61; vision judge: paddle hands,
+  lost forearms, stretched shins). The owner chose to **adopt the Quaternius 62-joint rig at
+  runtime** instead of warping: `NpcAvatar` maps the Quaternius joint names, gear attach points
+  are re-derived from the Quaternius skeleton (hip ≈0.87, shoulder ≈0.148/1.39, wrist ≈0.99,
+  knee ≈0.52), the mesh keeps source LOD (arm-down rest pose baked), and Idle/Walk play directly
+  on the 62-joint rig (no retarget).
 - **Engine baseline:** Godot 4.7.2 stable (official editor `~/.local/bin/godot`). The system's
   `godot-runner` cannot load arbitrary project paths (compiled without path overrides); use the
   official editor binary.