docs(15-02): complete OIDC auth integration plan

- Add 15-02-SUMMARY.md with execution results
- Update STATE.md with position, decisions, session info
- Update ROADMAP.md with plan progress
- Mark AUTH-01, AUTH-02, AUTH-03 requirements complete

.planning/STATE.md

@@ -1,16 +1,16 @@
 ---
 gsd_state_version: 1.0
-milestone: v2.0
-milestone_name: Platform Foundation
+milestone: v1.3
+milestone_name: Research & Decision Tools
 status: planning
-stopped_at: null
-last_updated: "2026-04-03"
+stopped_at: Completed 15-02-PLAN.md
+last_updated: "2026-04-04T18:47:52.641Z"
 last_activity: 2026-04-03 — v2.0 roadmap created (Phases 14-18)
 progress:
-  total_phases: 5
-  completed_phases: 0
-  total_plans: 0
-  completed_plans: 0
+  total_phases: 8
+  completed_phases: 7
+  total_plans: 13
+  completed_plans: 12
   percent: 0
 ---
 
@@ -35,6 +35,7 @@ Progress: [----------] 0% (v2.0 milestone)
 ## Performance Metrics
 
 **Velocity:**
+
 - Total plans completed: 0 (v2.0 milestone)
 - Average duration: --
 - Total execution time: --
@@ -46,12 +47,15 @@ Progress: [----------] 0% (v2.0 milestone)
 ### Decisions
 
 Key decisions made during v2.0 planning:
+
 - Platform pivot: single-user to multi-user with discovery-first approach
 - External auth provider (self-hosted, open-source) — Logto vs Authentik OPEN decision
 - SQLite to Postgres migration — required by auth provider and multi-user concurrency
 - Structured UGC only — ratings and predefined fields, no freeform text until moderation
 - Separate globalItems table — not a flag on user items table
 - Single-user SQLite mode diverges at v2.0 boundary
+- [Phase 15]: OIDC routes at root level (/login, /callback, /logout), API key routes under /api/auth
+- [Phase 15]: Three-way auth order: API key -> MCP Bearer -> OIDC session
 
 ### Pending Todos
 
@@ -64,6 +68,6 @@ None active.
 
 ## Session Continuity
 
-Last session: 2026-04-03
-Stopped at: v2.0 roadmap created with 5 phases (14-18) covering 30 requirements
+Last session: 2026-04-04T18:47:52.639Z
+Stopped at: Completed 15-02-PLAN.md
 Resume file: None