chore(agents): migrate to agents.md protocol — .agents/ wiki/plans/rules/skills

Root AGENTS.md is now a thin entry point + knowledge map; the batch-workflow
detail it duplicated already lived in .claude/skills/animation/SKILL.md.
Folded docs/ (dances registry + iclone-bridge stub), root plans/, and
devops-reports/ into .agents/wiki/ and .agents/plans/ per the per-repo .agents/
convention. Added .agents/SOUL.md, .agents/AGENTS.md, wiki/ARCHITECTURE.md,
wiki/architecture/, and wiki/master-plan.md (derived from the closed plans +
the dance registry's live ceremony-slot table). Fixed doc-path references in
exchange/GUIDE.md, the animation skill, and the iclone-bridge stub. All moves
via mv (git detected as renames) — no content deleted.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.agents/skills/README.md

@@ -0,0 +1,18 @@
+# skills/ — playbooks
+
+This repo's operator playbooks are Claude-Code-native skills and live at
+`.claude/skills/` (auto-discovered by Claude Code), not duplicated here:
+
+| Skill | Covers |
+|---|---|
+| `animation` | Operator playbook — the batch workflow, naming, loop QC, gotchas |
+| `animation-creation` | Authoring new clips on the shared Quaternius skeleton |
+| `iclone-video-mocap` | iClone 8 + Video Mocap: filming, cleanup, FBX export |
+| `pose-estimation` | Video→pose-landmark extraction (MediaPipe) |
+| `retarget-animations` | Deprecated early retarget notes, kept for history |
+
+An agent-level playbook (`loop-qc`) lives at `.claude/agents/loop-qc.md`. Follow
+the per-repo convention (`.agents/skills/` as the canonical location) once this
+repo's skills are ported off `.claude/`; until then this file is the pointer so
+there's a single place agents look, per the SoT rule (no second source of
+truth).