docs: create roadmap (4 phases)

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+See: .planning/PROJECT.md (updated 2026-03-12)
+
+**Core value:** Real-time rainfall and environmental sensor monitoring with automatic data transmission to myvscada server
+**Current focus:** Phase 1: Foundation & Kiosk UI
+
+## Current Position
+
+Phase: 1 of 4 (Foundation & Kiosk UI)
+Plan: Not yet planned
+Status: Ready to plan
+Last activity: 2026-03-12 — Roadmap created
+
+Progress: [░░░░░░░░░░] 0%
+
+## Performance Metrics
+
+**Velocity:**
+- Total plans completed: 0
+- Average duration: N/A
+- Total execution time: 0 hours
+
+**By Phase:**
+
+| Phase | Plans | Total | Avg/Plan |
+|-------|-------|-------|----------|
+| - | - | - | - |
+
+**Recent Trend:**
+- No execution yet
+
+*Updated after each plan completion*
+
+## Accumulated Context
+
+### Decisions
+
+Decisions are logged in PROJECT.md Key Decisions table.
+Recent decisions affecting current work:
+
+- [Research]: Selected Flask + Flask-SocketIO + Bootstrap stack for Pi Zero 2 W performance
+- [Research]: Four-phase vertical slice approach based on dependency analysis
+
+### Pending Todos
+
+[From .planning/todos/pending/ — ideas captured during sessions]
+
+None yet.
+
+### Blockers/Concerns
+
+[Issues that affect future work]
+
+None yet.
+
+## Session Continuity
+
+Last session: 2026-03-12
+Stopped at: Roadmap creation complete
+Resume file: None