[rennf93]

make test (the compose test service, pytest -v --cov=guard_core_mcp --cov-branch) gave 7 errors on master, on Python 3.10 and 3.14. It gives 157 passed here.

This repo tracks uv.lock (git ls-files uv.lock prints it), so --frozen and the lock mount are right and stay.

1. The package was not importable in the test container (ModuleNotFoundError: No module named 'guard_core_mcp', 6 errors). The Dockerfile copies the package after uv sync, so the project was never installed in the image and nothing put /app on sys.path. I added uv pip install --python .venv/bin/python --no-deps -e /app after the copy, which is what guard-core's Dockerfile does.
2. tests/test_sync_docs_script.py loads scripts/sync_docs.py, which the image did not contain (FileNotFoundError, 1 error). The Dockerfile now copies scripts/.

Verification, the compose test service run as the Makefile runs it, own compose project, master vs this branch:

• Python 3.10: master 7 errors; branch 157 passed.
• Python 3.14: master 7 errors; branch 157 passed.

Not verified: Python versions other than 3.10 and 3.14, hadolint cleanliness of this Dockerfile (it already had the apt and pip findings on master and I did not touch them), and the CI result (see the checks on this PR).