Improvements based on gemini-code-assist bot feedback:
1. **Proper importlib.resources implementation:**
- Use files("providers") / "../conf/custom_models.json" for resource loading
- Prioritize resource loading over file system paths for packaged environments
- Maintain backward compatibility with explicit config paths and env variables
2. **Remove redundant path checks:**
- Eliminated duplicate Path("conf/custom_models.json") and Path.cwd() / "conf/custom_models.json"
- Streamlined fallback logic to development path + working directory only
3. **Enhanced test coverage:**
- Mock-based testing of actual fallback scenarios with Path.exists
- Proper resource loading simulation and failure testing
- Comprehensive coverage of both resource and file system modes
4. **Robust error handling:**
- Graceful fallback from resources to file system when resource loading fails
- Clear logging of which loading method is being used
- Better error messages indicating resource vs file system loading
The implementation now follows Python packaging best practices using importlib.resources
while maintaining full backward compatibility and robust fallback behavior.
Tested: All 8 test cases pass, resource loading works in development,
file system fallback works when resources fail.
84de9b026f