docs: create roadmap (3 phases)

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+See: .planning/PROJECT.md (updated 2026-03-14)
+
+**Core value:** Make it effortless to manage gear and plan new purchases — see how a potential buy affects your total setup weight and cost before committing.
+**Current focus:** Phase 1: Foundation and Collection
+
+## Current Position
+
+Phase: 1 of 3 (Foundation and Collection)
+Plan: 0 of 0 in current phase
+Status: Ready to plan
+Last activity: 2026-03-14 — Roadmap created
+
+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]: 3-phase coarse structure — Collection, Threads, Setups+Dashboard
+- [Roadmap]: Setups and Dashboard combined into single phase (coarse granularity)
+
+### Pending Todos
+
+None yet.
+
+### Blockers/Concerns
+
+- Verify @hono/zod-validator supports Zod 4.x before starting Phase 1. If not, pin Zod 3.23.x.
+- Confirm Bun fullstack vs. Vite proxy dev setup pattern before project scaffolding.
+
+## Session Continuity
+
+Last session: 2026-03-14
+Stopped at: Roadmap created, ready to plan Phase 1
+Resume file: None