docs: create roadmap (4 phases)

Phases:
1. Foundation: Database models and IMAP utilities
2. Account Management: Admin UI for email configuration (ACCT-01 to ACCT-07)
3. Email Ingestion: Sync engine and retention cleanup (SYNC-01 to SYNC-09, RETN-01 to RETN-05)
4. Query Tools: LangChain email analytics (QUERY-01 to QUERY-06)

All v1 requirements mapped to phases.

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+See: .planning/PROJECT.md (updated 2026-02-04)
+
+**Core value:** Personal information retrieval through natural conversation - ask about any aspect of your documented life (papers, finances, meals, emails) and get accurate, context-aware answers.
+**Current focus:** Phase 1 - Foundation
+
+## Current Position
+
+Phase: 1 of 4 (Foundation)
+Plan: Ready to plan
+Status: Ready to plan
+Last activity: 2026-02-07 — 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:**
+- Last 5 plans: N/A
+- Trend: N/A
+
+*Updated after each plan completion*
+
+## Accumulated Context
+
+### Decisions
+
+Decisions are logged in PROJECT.md Key Decisions table.
+Recent decisions affecting current work:
+
+- IMAP only (no SMTP): User wants inbox analytics, not sending capabilities
+- Admin-only access: Email is privacy-sensitive, limit to trusted admins
+- 30-day retention: Balance utility with privacy/storage concerns
+- Scheduled sync: Reduces server load vs real-time polling
+- No attachment indexing: Complexity vs value, focus on text content first
+- ChromaDB for emails: Reuse existing vector store, no new infrastructure
+
+### Pending Todos
+
+None yet.
+
+### Blockers/Concerns
+
+None yet.
+
+## Session Continuity
+
+Last session: 2026-02-07
+Stopped at: Roadmap creation complete
+Resume file: None