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/STATE.md

@@ -3,8 +3,8 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: executing
-stopped_at: Completed 01-01-PLAN.md (3/3 auto tasks) — awaiting hardware checkpoint 4
-last_updated: "2026-04-03T11:18:22.810Z"
+stopped_at: Completed 01-01-PLAN.md (4/4 tasks) — hardware checkpoint approved, plan complete
+last_updated: "2026-04-03T11:21:33.574Z"
 last_activity: 2026-04-03
 progress:
   total_phases: 4
@@ -26,7 +26,7 @@ See: .planning/PROJECT.md (updated 2026-04-03)
 ## Current Position
 
 Phase: 01 (esp32-firmware) — EXECUTING
-Plan: 2 of 4
+Plan: 3 of 4
 Status: Ready to execute
 Last activity: 2026-04-03
 
@@ -53,6 +53,7 @@ Progress: [░░░░░░░░░░] 0%
 
 *Updated after each plan completion*
 | Phase 01-esp32-firmware P01 | 3 | 3 tasks | 6 files |
+| Phase 01-esp32-firmware P01 | 21min | 4 tasks | 7 files |
 
 ## Accumulated Context
 
@@ -67,6 +68,8 @@ Recent decisions affecting current work:
 - [Phase 01-esp32-firmware]: GPIO3 for SK6812 RMT (safe on SuperMini); GPIO6/7 for WS2801 SPI with GPIO0/1 fallback noted for JTAG conflicts
 - [Phase 01-esp32-firmware]: NeoWs2801Spi2MhzMethod for 5m cable signal integrity; NeoGrbwFeature for SK6812 RGBW 4-byte mode
 - [Phase 01-esp32-firmware]: -DESP32_ARDUINO_NO_RGB_BUILTIN mandatory in platformio.ini to prevent RMT driver conflict with Arduino core 3.x
+- [Phase 01-esp32-firmware]: Hardware coexistence validated: WIFI_PS_NONE eliminates RMT flicker on ESP32-C3, zero flicker confirmed during 30s UDP burst test
+- [Phase 01-esp32-firmware]: GPIO3/6/7 pin assignments confirmed on physical hardware — no JTAG conflicts, fallback GPIO0/1 not needed
 
 ### Pending Todos
 
@@ -81,6 +84,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-03T11:18:22.801Z
-Stopped at: Completed 01-01-PLAN.md (3/3 auto tasks) — awaiting hardware checkpoint 4
+Last session: 2026-04-03T11:21:33.565Z
+Stopped at: Completed 01-01-PLAN.md (4/4 tasks) — hardware checkpoint approved, plan complete
 Resume file: None