docs(04): create phase plan — 6 plans across 5 waves for shared lists + live sync

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.planning/ROADMAP.md

@@ -141,7 +141,31 @@ Plans:
   2. Either member can add items to a list, check items off, reorder them by drag-and-drop, and delete individual items
   3. When one member adds or checks off an item, the other member sees the change appear in the list within a few seconds without refreshing — even if they reconnect after a brief network gap
 
-**Plans**: TBD
+**Entry gate status (2026-06-08):** CLEARED — SSE-over-Pangolin smoke test PASSED (35 heartbeats over ~6 min, buffering off, no cut). Live sync may be built directly on SSE; polling fallback (D-12) retained as belt-and-suspenders.
+
+**Plans**: 6 plans
+Plans:
+**Wave 1**
+
+- [ ] 04-01-PLAN.md — Foundation + app shell: deps install (+ legitimacy gate), list tables generate+migrate [BLOCKING], API test harness + Wave-0 RED stubs, react-router + BottomTabBar + empty ListsIndex (D-13/D-16/D-17/D-18)
+
+**Wave 2** *(blocked on Wave 1)*
+
+- [ ] 04-02-PLAN.md — TDD: scoped in-memory fan-out (listEmitter) + getAccessibleListIds access scope — the load-bearing D-04 no-leak primitive (LIST-04)
+- [ ] 04-03-PLAN.md — List CRUD slice: POST/GET/PATCH/DELETE /api/lists with scoped access + auto-share-on-create + ListsIndex/ListCard/CreateListSheet/ListDeleteDialog (LIST-01, D-01/D-02/D-06)
+
+**Wave 3** *(blocked on Wave 2)*
+
+- [ ] 04-04-PLAN.md — Item CRUD + checked-sink slice: item endpoints + fractional rank + per-field LWW PATCH + ListDetail/ItemRow/AddItemInput + optimistic UI (LIST-02, D-05/D-07/D-08/D-09)
+
+**Wave 4** *(blocked on Wave 3)*
+
+- [ ] 04-05-PLAN.md — Reorder slice: dnd-kit sortable + generateKeyBetween rank + one-row position PATCH + animate-on-remote (LIST-03, D-13/D-14/D-15)
+
+**Wave 5** *(blocked on Waves 2 + 4)*
+
+- [ ] 04-06-PLAN.md — Live-sync slice: scoped /api/sse/lists + fan-out triggers + useListSSE bounded-backoff hook + LiveSyncIndicator + polling fallback (LIST-04, D-04/D-10/D-11/D-12)
+
 **UI hint**: yes
 
 ### Phase 5: Web Push Notifications
@@ -189,7 +213,7 @@ Note: Phase 4 depends only on Phase 1 and can begin as soon as Phase 1 is comple
 | 1. Foundation + Broker Spike | 4/4 | Complete   | 2026-06-04 |
 | 2. Calendar Display | 5/5 | Complete    | 2026-06-05 |
 | 3. Event Write-Back + PWA Install | 12/12 | Complete    | 2026-06-07 |
-| 4. Shared Lists + Live Sync | 0/? | Not started | - |
+| 4. Shared Lists + Live Sync | 0/6 | Planned | - |
 | 5. Web Push Notifications | 0/? | Not started | - |
 | 6. UX Polish | 0/? | Not started | - |