docs(07-10): complete debounced search test plan summary

- Created 07-10-SUMMARY.md documenting gap closure for verification gap 3
- Updated STATE.md: progress 100%, metrics recorded, decision logged, session updated
- Updated ROADMAP.md: Phase 7 complete (10/10 plans, 10/10 summaries)

.planning/ROADMAP.md

@@ -53,7 +53,7 @@ Plans:
   2. Running the audit returns a list of all access entries the user holds across the selected sites
   3. Results distinguish between direct role assignments, SharePoint group memberships, and inherited access
   4. Results can be exported to CSV or HTML in the same format established by v1.0 export patterns
-**Plans:** 10/10 plans (8 original + 2 gap-closure)
+**Plans:** 10/10 plans complete
 Plans:
 - [ ] 07-01-PLAN.md — UserAccessEntry model + service interfaces (Wave 1)
 - [ ] 07-02-PLAN.md — UserAccessAuditService implementation (Wave 2)
@@ -98,6 +98,6 @@ Plans:
 | 4. Bulk Operations and Provisioning | v1.0 | 10/10 | Complete | 2026-04-03 |
 | 5. Distribution and Hardening | v1.0 | 3/3 | Complete | 2026-04-03 |
 | 6. Global Site Selection | 5/5 | Complete   | 2026-04-07 | - |
-| 7. User Access Audit | 8/8 | Complete   | 2026-04-07 | - |
+| 7. User Access Audit | 10/10 | Complete   | 2026-04-07 | - |
 | 8. Simplified Permissions | v1.1 | 0/? | Not started | - |
 | 9. Storage Visualization | v1.1 | 0/? | Not started | - |