# Requirements: v1.21 Lean-Bridge Materialization Boundary Extraction And Closure

## Shipped requirements

- **MTN-18**: The shared Lean-bridge materialization lifecycle has left
  `aitp_service.py` for a dedicated support boundary.
- **DOC-21**: Docs, targeted Lean-bridge regressions, and maintainability
  budgets now lock the extracted Lean-bridge boundary.
