docs(06): create phase plan

Phase 06: Coordination
- 3 plans in 3 waves
- 06-01: Coordination Events & Port (Wave 1)
- 06-02: CoordinationManager Adapter (Wave 2)
- 06-03: tRPC & CLI Integration (Wave 3)
- Ready for execution

.planning/ROADMAP.md

@@ -113,11 +113,13 @@ Plans:
 **Goal**: Merge agent outputs into integration branch in dependency order, bounce conflicts back to agents
 **Depends on**: Phase 5
 **Requirements**: COORD-01, COORD-02
-**Research**: Unlikely (git merge patterns, but conflict detection needs care)
-**Plans**: TBD
+**Research**: Unlikely (programmatic coordination - gastown reference shows merge orchestration is code, not agent loop)
+**Plans**: 3 plans in 3 waves
 
 Plans:
-- [ ] 06-01: TBD
+- [ ] 06-01: Coordination Events & Port (Wave 1)
+- [ ] 06-02: CoordinationManager Adapter (Wave 2)
+- [ ] 06-03: tRPC & CLI Integration (Wave 3)
 
 ### Phase 7: File System UI
 **Goal**: Bidirectional sync between SQLite state and filesystem — agent messages as files, user responds via files
@@ -144,7 +146,7 @@ Phases execute in numeric order: 1 → 1.1 → 2 → 3 → 4 → 5 → 6 → 7
 | 3. Git Integration | 2/2 | Complete | 2026-01-30 |
 | 4. Agent Lifecycle | 4/4 | Complete | 2026-01-30 |
 | 5. Task Dispatch | 5/5 | Complete | 2026-01-30 |
-| 6. Coordination | 0/? | Not started | - |
+| 6. Coordination | 0/3 | Not started | - |
 | 7. File System UI | 0/? | Not started | - |
 
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