docs(01-03): complete animation engine plan — 8 animations, 50fps FreeRTOS task, RGBW support

- SUMMARY documents ANIM_REGISTRY name strings for Pi-side use
- W auto-derive formula documented for Phase 2 reference
- FW-03 (8 animations) and FW-04 (configurable params) requirements marked complete
- STATE updated: plan 4/4, progress 75%, decisions added

.planning/STATE.md

@@ -2,15 +2,15 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: executing
-stopped_at: Completed 01-02-PLAN.md (2/2 tasks) — protocol.h/.cpp and wifi_server.h/.cpp implemented
-last_updated: "2026-04-03T11:27:16.228Z"
+status: verifying
+stopped_at: Completed 01-03-PLAN.md (2/2 tasks) — animation engine and 8 animations implemented
+last_updated: "2026-04-03T11:30:12.968Z"
 last_activity: 2026-04-03
 progress:
   total_phases: 4
   completed_phases: 0
   total_plans: 4
-  completed_plans: 2
+  completed_plans: 3
   percent: 0
 ---
 
@@ -27,7 +27,7 @@ See: .planning/PROJECT.md (updated 2026-04-03)
 
 Phase: 01 (esp32-firmware) — EXECUTING
 Plan: 4 of 4
-Status: Ready to execute
+Status: Phase complete — ready for verification
 Last activity: 2026-04-03
 
 Progress: [░░░░░░░░░░] 0%
@@ -55,6 +55,7 @@ Progress: [░░░░░░░░░░] 0%
 | Phase 01-esp32-firmware P01 | 3 | 3 tasks | 6 files |
 | Phase 01-esp32-firmware P01 | 21min | 4 tasks | 7 files |
 | Phase 01-esp32-firmware P02 | 3min | 2 tasks | 5 files |
+| Phase 01-esp32-firmware P03 | 14 | 2 tasks | 11 files |
 
 ## Accumulated Context
 
@@ -74,6 +75,8 @@ Recent decisions affecting current work:
 - [Phase 01-esp32-firmware]: Two-queue FreeRTOS pattern: xQueueSendFromISR in AsyncUDP callback, parseTask drains rawQueue and dispatches LedCommand to commandQueue — prevents watchdog resets from JSON heap alloc in callback
 - [Phase 01-esp32-firmware]: STATUS cmd handled inline in parseTask (no animation engine route) — needs sender IP/port from raw packet context, responds via udp.writeTo()
 - [Phase 01-esp32-firmware]: parseCommand() enforces brightness cap (max 60%) per D-09 — firmware-side safety cap regardless of Pi value
+- [Phase 01-esp32-firmware]: vTaskDelayUntil for 50fps drift-free animation tick — never drifts by compute time unlike vTaskDelay
+- [Phase 01-esp32-firmware]: autoWhite formula: min(r,g,b)/2 warm-white approximation — triggers only when W=0 on RGBW strips
 
 ### Pending Todos
 
@@ -88,6 +91,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-03T11:27:16.219Z
-Stopped at: Completed 01-02-PLAN.md (2/2 tasks) — protocol.h/.cpp and wifi_server.h/.cpp implemented
+Last session: 2026-04-03T11:30:12.955Z
+Stopped at: Completed 01-03-PLAN.md (2/2 tasks) — animation engine and 8 animations implemented
 Resume file: None