docs(02-02): complete file navigation and export plan

- Update STATE.md with plan completion status
- Update ROADMAP.md progress (Phase 2 now complete)
- Add SUMMARY.md documenting implementation

.planning/STATE.md

@@ -2,15 +2,17 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: Phase 1 executed successfully
-stopped_at: Phase 2 context gathered
-last_updated: "2026-03-11T22:40:23.528Z"
-last_activity: 2026-03-12 — Phase 1 complete
+status: Phase 2 plan 2 executed
+stopped_at: Completed 02-02-PLAN.md
+last_updated: "2026-03-12T00:04:19Z"
+last_activity: 2026-03-12 — Phase 2 plan 2 complete
+current_plan: 2
+total_plans: 2
 progress:
   total_phases: 4
   completed_phases: 1
-  total_plans: 1
-  completed_plans: 1
+  total_plans: 2
+  completed_plans: 2
   percent: 100
 ---