docs(02-02): complete state machine and scoring plan

- Created 02-02-SUMMARY.md documenting full game state machine implementation
- STATE.md updated: Phase 2 complete (2/2 plans), decisions 15-17 added
- ROADMAP.md updated: Phase 2 marked Complete (2 plans, 2 summaries)
- REQUIREMENTS.md: CORE-05 and CORE-06 marked complete

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.planning/config.json

@@ -8,6 +8,7 @@
     "research": true,
     "plan_check": true,
     "verifier": true,
-    "nyquist_validation": true
+    "nyquist_validation": true,
+    "_auto_chain_active": false
   }
-}
+}