fix(audit): converge on the 2026-07-23 animation standard — tool sync, QuatSkin INBOX, registry corrections

From the conformance audit (ariki-game .agents/audits/animation-standard-assessment-2026-07-23.md):
- tools/: cc_retarget + mixamo_retarget re-synced from ariki-game (were stale forks
  missing --despike/--fingers/--map ual); kevin_retarget path now repo-relative;
  mirror rule documented in exchange/GUIDE.md
- INBOX/lena: add canonical Ariki_Female_QuatSkin.glb; README marks MixamoSkin superseded
- REGISTRY: tide_dance_01 flagged (no DanceType enum entry); rain_dance note corrected
  (RainDance IS in the enum); boat table notes live canoedismount1/run_to_dive; QC split
  (loop_qc pre-commit vs anim_qc post-ingest) documented
- docs/iclone-bridge.md: stub created (GUIDE referenced it but it never existed)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

exchange/GUIDE.md

@@ -7,7 +7,13 @@ this file tells you which folder to use, when a file moves to the next stage, an
 when the previous version gets archived.
 
 Related docs: `docs/dances/REGISTRY.md` (naming — the source of truth),
-`docs/iclone-bridge.md`, and the `animation` skill (batch workflow details).
+`docs/iclone-bridge.md` (PC-lane overview), and the `animation` skill (batch workflow details).
+
+**Tool mirroring rule (audit 2026-07-23):** the retargeters in `tools/`
+(`cc_retarget.py`, `mixamo_retarget.py`, `kevin_retarget.py`, `mocap_retarget.py`) are
+**mirrors of `ariki-game/tools/`** — the game copies are authoritative. Never edit them
+here; re-copy from ariki-game when they change (they silently diverged once already:
+2026-07-15 → 2026-07-23, losing `--despike`/`--fingers`/`--map ual`).
 
 ---