plan: Phase 8 DAG System TDD with 2 plans

- 08-01: GameDAGRouter edge cases and anchor validation TDD (17+ tests)
- 08-02: Performance with large datasets (10K+ games) and diversity coverage TDD

TDD discipline: tests define correctness, code must match.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/ROADMAP.md

@@ -37,10 +37,11 @@
 **Goal**: Performance and edge case tests with tens of thousands of objects; fix code if tests fail
 **Depends on**: v1.0 milestone complete
 **Research**: Unlikely (internal patterns, existing code)
-**Plans**: TBD
+**Plans**: 2
 
 Plans:
-- [ ] 08-01: TBD (run /gsd:plan-phase 8 to break down)
+- [ ] 08-01: GameDAGRouter edge cases and anchor validation TDD
+- [ ] 08-02: GameDAGRouter performance with large datasets and diversity coverage TDD
 
 #### Phase 9: Trip Planner Modes TDD
 
@@ -108,7 +109,7 @@ Plans:
 | 5. CloudKit CRUD | v1.0 | 2/2 | Complete | 2026-01-10 |
 | 6. Validation Reports | v1.0 | 1/1 | Complete | 2026-01-10 |
 | 7. Testing & Documentation | v1.0 | 1/1 | Complete | 2026-01-10 |
-| 8. DAG System TDD | v1.1 | 0/? | Not started | - |
+| 8. DAG System TDD | v1.1 | 0/2 | Planned | - |
 | 9. Trip Planner Modes TDD | v1.1 | 0/? | Not started | - |
 | 10. Trip Builder Options TDD | v1.1 | 0/? | Not started | - |
 | 11. Itinerary & Constraints TDD | v1.1 | 0/? | Not started | - |