docs(04-05): checkpoint — Phase 4 human verification pending

- Created 04-05-SUMMARY.md for browser end-to-end verification checkpoint
- STATE.md progress updated to 100% (18/18 plans)
- ROADMAP.md phase 4 marked Complete (5/5 summaries)

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: executing
-stopped_at: Completed 04-review-download-security-04-04-PLAN.md
-last_updated: "2026-03-27T10:56:58.547Z"
+stopped_at: "Checkpoint 04-05: awaiting human verification of Phase 4 browser end-to-end"
+last_updated: "2026-03-27T10:58:58.010Z"
 last_activity: 2026-03-26 — Completed plan 01-02 (Backend Schema Registry)
 progress:
   total_phases: 4
-  completed_phases: 3
+  completed_phases: 4
   total_plans: 18
-  completed_plans: 17
+  completed_plans: 18
   percent: 50
 ---
 
@@ -65,6 +65,7 @@ Progress: [█████░░░░░] 50%
 | Phase 04-review-download-security P02 | 2min | 2 tasks | 5 files |
 | Phase 04-review-download-security P03 | 4min | 1 tasks | 2 files |
 | Phase 04-review-download-security P04 | 1min | 1 tasks | 2 files |
+| Phase 04-review-download-security P05 | 1min | 1 tasks | 0 files |
 
 ## Accumulated Context
 
@@ -117,6 +118,7 @@ Recent decisions affecting current work:
 - [Phase 04-review-download-security]: [04-03] vi.stubGlobal must come after vi.clearAllMocks in beforeEach — clear order matters for mock reliability
 - [Phase 04-review-download-security]: [04-03] Native DOM .disabled/.checked properties used instead of jest-dom matchers — jest-dom not installed in this project
 - [Phase 04-review-download-security]: [04-04] No logic changes needed in App.tsx — Math.min clamp already handled 4 steps correctly once ReviewStep added to array
+- [Phase 04-review-download-security]: [04-05] Human verification checkpoint reached — browser verification of full Phase 4 feature set pending user approval
 
 ### Pending Todos
 
@@ -130,6 +132,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-27T10:56:58.542Z
-Stopped at: Completed 04-review-download-security-04-04-PLAN.md
+Last session: 2026-03-27T10:58:58.003Z
+Stopped at: Checkpoint 04-05: awaiting human verification of Phase 4 browser end-to-end
 Resume file: None