# Phase 109 Summary

Status: implemented on `main`

## Goal

Lock the compatibility-surface pruning contract in service tests.

## What Landed

- new service-level cleanup test file:
  `research/knowledge-hub/tests/test_runtime_compat_surface_cleanup.py`

## Outcome

Phase `109` is complete.
`v1.59` is active on a compatibility-surface pruning contract baseline.
