Critical Fix:
- Fixed ModuleNotFoundError: No module named 'main'
- Changed from packages=find_packages() to py_modules=['main']
- main.py is now correctly included in the package

Root Cause:
- find_packages() only discovers packages (directories with __init__.py)
- main.py is a standalone module at root level, not in a package
- Need to use py_modules instead

Now works correctly with:
- uvx bachai-data-analysis-mcp@1.1.6 ✅
- pip install bachai-data-analysis-mcp ✅
- All entry points functional ✅