- Deliverable service auto-creates 10 pipeline stages on creation
- Stages start as BLOCKED/NOT_STARTED based on dependency rules
- Dependency engine: canStageStart() validates all prerequisites
- Stage machine: enforces valid status transitions
- Critical gate approval auto-unblocks downstream stages
- API routes for deliverables (nested under projects) and stages
- Zod validators for deliverable create/update
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>