chore: archive v1.1 Enhanced Reports milestone

v1.1 shipped with 4 phases (25 plans), 10/10 requirements complete:
- Global site selection (toolbar picker, all tabs consume)
- User access audit (Graph people-picker, direct/group/inherited)
- Simplified permissions (plain-language labels, risk levels, detail toggle)
- Storage visualization (LiveCharts2 pie/donut + bar charts)

Post-phase polish: centralized site selection (removed per-tab pickers),
claims prefix stripping, StorageMetrics backfill, chart tooltip fix,
summary stats in app + HTML exports.

205 tests passing, 10,484 LOC.

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

.planning/STATE.md

@@ -1,11 +1,11 @@
 ---
 gsd_state_version: 1.0
-milestone: v1.0
-milestone_name: milestone
-status: completed
-stopped_at: Completed 09-04-PLAN.md
-last_updated: "2026-04-07T13:40:30Z"
-last_activity: 2026-04-07 — Completed 09-04 (StorageViewModel chart unit tests)
+milestone: v1.1
+milestone_name: v1.1 Enhanced Reports
+status: shipped
+stopped_at: Milestone archived
+last_updated: "2026-04-08T00:00:00Z"
+last_activity: 2026-04-08 — v1.1 milestone archived and tagged
 progress:
   total_phases: 4
   completed_phases: 4