docs(04-04): complete Phase 04 verification, close phase

Human verified marketplace features on localhost. 26 tests green.
Reverse proxy API URL config deferred. Phase 04 done, ready for Phase 05.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: executing
-stopped_at: Phase 4 UI-SPEC approved
-last_updated: "2026-06-22T12:42:52.447Z"
-last_activity: 2026-06-23 -- Plan 04-03 completed
+stopped_at: Phase 04 complete, ready for Phase 05
+last_updated: "2026-06-23T09:03:59.869Z"
+last_activity: 2026-06-23 -- Phase 04 completed (marketplace + portal navigation)
 progress:
   total_phases: 6
   completed_phases: 2
   total_plans: 16
-  completed_plans: 11
+  completed_plans: 14
   percent: 33
 ---
 
@@ -93,6 +93,6 @@ Items acknowledged and carried forward from previous milestone close:
 
 ## Session Continuity
 
-Last session: 2026-06-23T08:22:00Z
-Stopped at: Plan 04-03 complete, 04-04 ready
+Last session: 2026-06-23T09:03:59.861Z
+Stopped at: context exhaustion at 75% (2026-06-23)
 Resume file: .planning/phases/04-marketplace-portal-navigation/04-04-PLAN.md