Summary

• Reject non-latest versions for Homebrew artifacts instead of logging a version that is not honored
• Honor BASE_PROJECT_VENV_DIR when installing Python artifacts into a project venv
• Clarify logging when a project manifest has no artifacts but Base default artifacts are still installed
• Capture subprocess stderr on artifact install failures and include it in the error path
• Add focused tests for the updated setup behavior

Testing

• env PYTHONPATH=lib/python:cli/python ~/.base.d/base/.venv/bin/python -m unittest discover -s cli/python/base_setup/tests
• env PYTHONPATH=lib/python:cli/python ~/.base.d/base/.venv/bin/python -m unittest discover -s lib/python/base_cli/tests
• env PYTHONPATH=lib/python:cli/python ~/.base.d/base/.venv/bin/python -m pylint --rcfile=.pylintrc $(git ls-files '*.py')