docs: create roadmap (4 phases)

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+See: .planning/PROJECT.md (updated 2026-04-03)
+
+**Core value:** Songs mit LED-Animationen choreografieren und abspielen — der Nutzer baut Timeline-basierte Lichtshows zu seiner Musik.
+**Current focus:** Phase 1 — ESP32 Firmware
+
+## Current Position
+
+Phase: 1 of 4 (ESP32 Firmware)
+Plan: 0 of ? in current phase
+Status: Ready to plan
+Last activity: 2026-04-03 — Roadmap created, all 23 v1 requirements mapped to 4 phases
+
+Progress: [░░░░░░░░░░] 0%
+
+## Performance Metrics
+
+**Velocity:**
+- Total plans completed: 0
+- Average duration: -
+- Total execution time: 0 hours
+
+**By Phase:**
+
+| Phase | Plans | Total | Avg/Plan |
+|-------|-------|-------|----------|
+| - | - | - | - |
+
+**Recent Trend:**
+- Last 5 plans: -
+- Trend: -
+
+*Updated after each plan completion*
+
+## Accumulated Context
+
+### Decisions
+
+Decisions are logged in PROJECT.md Key Decisions table.
+Recent decisions affecting current work:
+
+- [Roadmap]: Hardware-first build order — ESP32 is the validation target for all Pi-side work; developing against a mock risks protocol mismatches late.
+- [Roadmap]: WiFi+RMT coexistence must be tested on day 1 of Phase 1 (documented FastLED #1657, February 2026 — actively problematic on single-core ESP32-C3).
+- [Roadmap]: SK6812 is RGBW (4 bytes/LED) — configure explicitly before any animation code; retrofitting requires protocol version bump.
+
+### Pending Todos
+
+None yet.
+
+### Blockers/Concerns
+
+- [Phase 1]: ESP32-C3 RMT+WiFi coexistence has conflicting documentation — test simultaneously on first flash.
+- [Phase 1]: GPIO pin assignment for simultaneous RMT (SK6812) + SPI (WS2801) on SuperMini needs hardware validation.
+- [Phase 2]: aubio 0.4.9 ARM pip wheel on Raspberry Pi OS bookworm unverified — may require source build.
+- [Phase 2]: sounddevice + miniaudio simultaneous PipeWire access needs early testing.
+
+## Session Continuity
+
+Last session: 2026-04-03
+Stopped at: Roadmap written, STATE.md initialized. No plans exist yet.
+Resume file: None