docs(01-01): complete plan — hardware checkpoint approved, coexistence validated

- Task 4 hardware checkpoint approved: zero flicker during 30s UDP burst test
- WIFI_PS_NONE confirmed working on ESP32-C3 SuperMini
- GPIO3/6/7 pin assignments validated on physical hardware
- Updated SUMMARY.md with hardware test result and plan completion
- STATE.md advanced to plan 3, progress bar updated to 25%

.planning/config.json

@@ -25,7 +25,8 @@
     "text_mode": false,
     "research_before_questions": false,
     "discuss_mode": "discuss",
-    "skip_discuss": false
+    "skip_discuss": false,
+    "_auto_chain_active": true
   },
   "hooks": {
     "context_warnings": true