Changes:
- Add fix_python_association.cmd to fix .py file association
- Update README with Windows Store Python troubleshooting section
- Update Node Mappings section to reflect auto-discovery from .gitmodules
- Script now uses C:\Python312\python.exe for file associations
The Windows Store Python issue:
- Windows Store installs Python "stubs" in WindowsApps folder
- These stubs take precedence over real Python installations
- Running .py files directly uses stubs (wrong Python)
- Running 'python script.py' uses PATH Python (correct)
Three solutions provided:
1. Fix file association with provided batch script (recommended)
2. Disable Windows Store Python stubs in Settings
3. Always prefix with 'python' command (workaround)
