docs: create roadmap (4 phases)

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+See: .planning/PROJECT.md (updated 2026-03-15)
+
+**Core value:** Users can see what needs doing today, mark it done, and trust the app to schedule the next occurrence — without thinking about it.
+**Current focus:** Phase 1: Foundation
+
+## Current Position
+
+Phase: 1 of 4 (Foundation)
+Plan: 0 of TBD in current phase
+Status: Ready to plan
+Last activity: 2026-03-15 — Roadmap created, all 4 phases defined, 30 requirements mapped
+
+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: none yet
+- Trend: -
+
+*Updated after each plan completion*
+
+## Accumulated Context
+
+### Decisions
+
+Decisions are logged in PROJECT.md Key Decisions table.
+Recent decisions affecting current work:
+
+- [Pre-phase]: Riverpod 3.3 requires Flutter 3.41+ — verify before scaffolding
+- [Pre-phase]: All due dates stored as date-only (calendar day), not DateTime — enforce from first migration
+- [Pre-phase]: German-only UI for MVP; localization infrastructure (ARB + AppLocalizations) required from Phase 1 even with one locale
+- [Pre-phase]: riverpod_lint must be active before any feature code — catches ref.watch outside build() at analysis time
+- [Pre-phase]: drift_dev make-migrations workflow must be established in Phase 1 — recovery cost is data loss
+
+### Pending Todos
+
+None yet.
+
+### Blockers/Concerns
+
+- [Research]: Recurrence policy edge cases not fully specified — "monthly" on the 31st, seasonal interval definition. Decide before Phase 2 planning.
+- [Research]: Notification time configuration (user-adjustable vs hardcoded) not resolved. Decide before Phase 4 planning.
+- [Research]: First-launch template seeding UX (silent vs prompted) not resolved. Decide before Phase 2 planning.
+
+## Session Continuity
+
+Last session: 2026-03-15
+Stopped at: Roadmap created — ready to plan Phase 1
+Resume file: None