- Restrict setuptools package discovery to src/ (pkgmgr* only)
- Drop config/ as a Python package mapping (keep config as plain data dir)
- Remove config_defaults fallback paths and use config/ exclusively
- Add unit + integration tests for defaults.yaml loading and CLI update copying
https://chatgpt.com/share/6947e74f-573c-800f-b93d-5ed341fcd1a3