# v1.54 Milestone Audit

Status: passed

## Scope Closed

- Phase `94`: subprocess error contracts
- Phase `95`: service and frontdoor subprocess diagnostics
- Phase `96`: closure and regression audit

## Production Outcome

`v1.54` now exposes a reviewable subprocess-error surface through:

- `research/knowledge-hub/knowledge_hub/subprocess_error_support.py`
- `research/knowledge-hub/knowledge_hub/aitp_service.py`
- `research/knowledge-hub/knowledge_hub/frontdoor_support.py`
- `research/knowledge-hub/tests/test_subprocess_error_contracts.py`

## Verification Evidence

- subprocess error contract slice:
  - `python -m pytest research/knowledge-hub/tests/test_subprocess_error_contracts.py -q`
  - result: `2 passed`
- migrate-local-install regression slice:
  - `python -m pytest research/knowledge-hub/tests/test_aitp_service.py::AITPServiceTests::test_migrate_local_install_moves_workspace_legacy_and_records_pip_actions research/knowledge-hub/tests/test_aitp_service.py::AITPServiceTests::test_migrate_local_install_reports_runtime_convergence_before_and_after -q`
  - result: `2 passed`
- maintainability budget:
  - `python -m pytest research/knowledge-hub/tests/test_maintainability_budgets.py::MaintainabilityBudgetTests::test_watchlisted_files_stay_within_declared_budgets -q`
  - result: `1 passed`
- full knowledge-hub suite:
  - `python -m pytest research/knowledge-hub/tests -q`
  - result: `335 passed, 10 subtests passed`
