docs: create roadmap (5 phases), research complete

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+See: .planning/PROJECT.md (updated 2026-04-02)
+
+**Core value:** Administrators can audit and manage SharePoint/Teams permissions and storage across multiple client tenants from a single, reliable desktop application.
+**Current focus:** Phase 1 — Foundation
+
+## Current Position
+
+Phase: 1 of 5 (Foundation)
+Plan: 0 of ? in current phase
+Status: Ready to plan
+Last activity: 2026-04-02 — Roadmap created, requirements mapped, all 42 v1 requirements assigned to 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:
+
+- Foundation: Use PnP.Framework 1.18.0 (not PnP.Core SDK) — PnP Provisioning Engine lives only in PnP.Framework
+- Foundation: Use MsalCacheHelper for per-tenant token cache serialization — scope IPublicClientApplication per ClientId
+- Foundation: Never set PublishTrimmed=true — PnP.Framework and MSAL use reflection; accept ~150-200 MB EXE
+- Foundation: Establish AsyncRelayCommand + IProgress<T> + CancellationToken patterns before any feature work — retrofitting is the most expensive WPF refactor
+
+### Pending Todos
+
+None yet.
+
+### Blockers/Concerns
+
+- Phase 3 planning: Duplicate detection at scale (100k+ files) — Graph API hash enumeration limits and client-side SHA256 approach need targeted research before planning
+- Phase 4 planning: PnP Provisioning Engine behavior for Teams-connected modern sites — edge cases need validation spike before planning
+- Phase 5: User access export (v2 requirement UACC-01/02) depends on Phase 2 PermissionsService — confirm scope before Phase 5 planning
+
+## Session Continuity
+
+Last session: 2026-04-02
+Stopped at: Roadmap created, STATE.md initialized — ready to run /gsd:plan-phase 1
+Resume file: None