docs(05-03): complete shared-volume attachment hardening plan

- add 05-03 summary with task commits and verification details
- update roadmap and state for completed Phase 05 plan 03

.planning/ROADMAP.md

@@ -64,6 +64,29 @@ Plans:
 
 ---
 
+### Phase 05: MVP Deployment
+
+**Goal:** Подготовить Matrix-бот к реальному деплою на lambda.coredump.ru без потери Space+rooms UX: закрепить per-room `platform_chat_id`, реальный `!clear`, reconciliation, file transfer через shared volume и разделение prod/fullstack compose.
+
+**Depends on:** Phase 4
+
+**Plans:** 1/4 plans executed
+
+Plans:
+- [ ] 05-01-PLAN.md — Startup reconciliation from authoritative Matrix Space topology before live sync
+- [ ] 05-02-PLAN.md — Room-local `platform_chat_id` routing and real `!clear` semantics
+- [x] 05-03-PLAN.md — Shared-volume attachment path hardening for `/agents` deployment
+- [ ] 05-04-PLAN.md — Split bot-only prod compose from internal fullstack compose and update docs
+
+**Deliverables:**
+- Space+rooms onboarding remains the primary Matrix UX
+- Per-room `platform_chat_id` provides true context isolation and `!clear`
+- Reconciliation restores room metadata and routing after restart
+- File transfer uses shared `/agents/` volume with room-safe behavior
+- `docker-compose.prod.yml` is bot-only handoff; `docker-compose.fullstack.yml` is for internal E2E testing
+
+---
+
 ### Phase 3: Production Hardening
 
 **Goal:** Подготовить боты к реальному деплою — конфиг, логирование, мониторинг, обработка ошибок.