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

## Overview

`v1.21` is shipped.

It extracted the shared Lean-bridge materialization lifecycle out of
`aitp_service.py` while keeping the public service method stable.

## Phases

- [x] **Phase 72: Lean-Bridge Materialization Boundary Extraction**
- [x] **Phase 73: Lean-Bridge Docs And Regression Lock**
- [x] **Phase 74: Milestone Closure And Maintainability Lock**
