docs(05-03): complete pushCoalescer TDD 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: "2026-06-10T00:55:56.184Z"
+last_updated: "2026-06-10T01:00:12.755Z"
 last_activity: 2026-06-10 -- Phase 05 execution started
 progress:
   total_phases: 15
   completed_phases: 4
   total_plans: 36
-  completed_plans: 30
+  completed_plans: 31
   percent: 27
 ---
 
@@ -26,7 +26,7 @@ See: .planning/PROJECT.md (updated 2026-06-07)
 ## Current Position
 
 Phase: 05 (web-push-notifications) — EXECUTING
-Plan: 3 of 8
+Plan: 4 of 8
 Status: Ready to execute
 Last activity: 2026-06-10 -- Phase 05 execution started
 
@@ -67,6 +67,7 @@ Progress: [██████████] 100%
 | Phase 04 P07 | 6 | 2 tasks | 4 files |
 | Phase 05 P01 | 20 | 4 tasks | 15 files |
 | Phase 05 P02 | 5 | 1 tasks | 1 files |
+| Phase 05 P03 | 5 | - tasks | - files |
 
 ## Accumulated Context
 
@@ -104,6 +105,7 @@ Recent decisions affecting current work:
 - [Phase 04-07]: D-04-07-guard: isShared owner-only guard placed after access check, before updateValues construction; mirrors DELETE handler idiom (if !access.isOwner → 403)
 - [Phase ?]: VAPID config is env-injected at runtime via docker-compose.yml environment block; no key baked into image (Phase 5 D-transposability)
 - [Phase ?]: dispatchPush uses sub.id (not a separate dbRowId argument) — 2-arg signature matches existing test
+- [Phase ?]: coalesceListPush dispatch signature is (listId, actorId, count) — test scaffold canonical; richer payload deferred to Plan 05-05 caller
 
 ### Roadmap Evolution
 
@@ -145,6 +147,6 @@ Recent decisions affecting current work:
 
 ## Session Continuity
 
-Last session: 2026-06-10T00:55:56.178Z
+Last session: 2026-06-10T01:00:09.552Z
 Stopped at: Completed 05-02-PLAN.md
 Resume file: None