feat: core improvements — feedback loop, attention filters, shadow heuristics, metrics, auto-activation

- Cross-cycle feedback protocol with structured finding format, routing, and resolution tracking
- Attention filter enforcement: explicit context include/exclude per archetype
- Shadow detection: quantitative checklists with concrete thresholds
- Orchestration metrics: per-phase timing, agent count, findings summary
- Autonomous mode wiring: checkpoint protocol, session log, stop conditions
- Auto-activation: SessionStart hook fires ArcheFlow for implementation tasks without user config
- Emoji avatars for all 7 archetypes
- Standardized finding format across all reviewers for cross-cycle tracking
- Persisted implementation plan in docs/

hooks/hooks.json

@@ -2,7 +2,7 @@
   "hooks": {
     "SessionStart": [
       {
-        "matcher": "startup|clear|compact",
+        "matcher": "startup|resume|clear|compact",
         "hooks": [
           {
             "type": "command",