Migration Planning Breakdown

Decompose migration from {{model_v1}} to {{model_v2}} into phases.

Phase 1 - Assessment:
- Capability comparison
- Breaking change identification
- Risk assessment

Phase 2 - Preparation:
- Test suite updates
- Prompt adjustments
- Rollback planning

Phase 3 - Migration:
- Shadow deployment
- Gradual traffic shift
- Performance monitoring

Phase 4 - Validation:
- Full regression testing
- User feedback collection
- Deprecation of old version

Create timeline for {{migration_window}} with go/no-go criteria.