docs(15-03): complete client auth UI and test updates plan

- SUMMARY.md with OIDC login redirect, auth hook cleanup, E2E seed, test updates
- STATE.md updated with decisions and session info
- ROADMAP.md updated with phase 15 progress
- Requirements AUTH-01, AUTH-02, AUTH-05 marked complete

.planning/REQUIREMENTS.md

@@ -17,11 +17,11 @@ Requirements for this milestone. Each maps to roadmap phases.
 
 ### Authentication
 
-- [ ] **AUTH-01**: User can register an account via external OIDC auth provider
-- [ ] **AUTH-02**: User can log in via external auth provider and access their data
+- [x] **AUTH-01**: User can register an account via external OIDC auth provider
+- [x] **AUTH-02**: User can log in via external auth provider and access their data
 - [ ] **AUTH-03**: API keys remain functional for programmatic access (MCP, scripts)
 - [ ] **AUTH-04**: Auth provider runs self-hosted alongside the application
-- [ ] **AUTH-05**: E2E tests authenticate via API keys without depending on the auth provider
+- [x] **AUTH-05**: E2E tests authenticate via API keys without depending on the auth provider
 
 ### Multi-User Data Model
 
@@ -121,11 +121,11 @@ Which phases cover which requirements. Updated during roadmap creation.
 | DB-03 | Phase 14 | Pending |
 | DB-04 | Phase 14 | Pending |
 | DB-05 | Phase 14 | Pending |
-| AUTH-01 | Phase 15 | Pending |
-| AUTH-02 | Phase 15 | Pending |
+| AUTH-01 | Phase 15 | Complete |
+| AUTH-02 | Phase 15 | Complete |
 | AUTH-03 | Phase 15 | Pending |
 | AUTH-04 | Phase 15 | Pending |
-| AUTH-05 | Phase 15 | Pending |
+| AUTH-05 | Phase 15 | Complete |
 | MULTI-01 | Phase 16 | Pending |
 | MULTI-02 | Phase 16 | Pending |
 | MULTI-03 | Phase 16 | Pending |