docs(05-04): complete push vertical slice plan

.planning/STATE.md

@@ -4,13 +4,13 @@ milestone: v1.0
 milestone_name: milestone
 status: executing
 stopped_at: Completed 05-02-PLAN.md
-last_updated: "2026-06-10T01:00:12.755Z"
-last_activity: 2026-06-10 -- Phase 05 execution started
+last_updated: "2026-06-10T01:16:12.195Z"
+last_activity: 2026-06-10
 progress:
   total_phases: 15
   completed_phases: 4
   total_plans: 36
-  completed_plans: 31
+  completed_plans: 32
   percent: 27
 ---
 
@@ -26,11 +26,11 @@ See: .planning/PROJECT.md (updated 2026-06-07)
 ## Current Position
 
 Phase: 05 (web-push-notifications) — EXECUTING
-Plan: 4 of 8
+Plan: 5 of 8
 Status: Ready to execute
-Last activity: 2026-06-10 -- Phase 05 execution started
+Last activity: 2026-06-10
 
-Progress: [██████████] 100%
+Progress: [█████████░] 89%
 
 ## Performance Metrics
 
@@ -68,6 +68,7 @@ Progress: [██████████] 100%
 | Phase 05 P01 | 20 | 4 tasks | 15 files |
 | Phase 05 P02 | 5 | 1 tasks | 1 files |
 | Phase 05 P03 | 5 | - tasks | - files |
+| Phase 05 P04 | 11 | 3 tasks | 9 files |
 
 ## Accumulated Context
 
@@ -147,6 +148,6 @@ Recent decisions affecting current work:
 
 ## Session Continuity
 
-Last session: 2026-06-10T01:00:09.552Z
+Last session: 2026-06-10T01:16:12.175Z
 Stopped at: Completed 05-02-PLAN.md
 Resume file: None