- Add detailed PY2PHP.md documentation covering usage, architecture, statement/expression support matrix
- Document function signature conversion rules and print/sys.exit lowering behavior
- Include known behaviors and unsupported syntax with error messages
- Create comprehensive test suite for PythonAstLoader with real Python subprocess integration
- Add extensive test coverage for PythonToTypePhpConverter including supported/unsupported syntax cases
- Implement CLI layer tests for --convert-python-to-php command with various scenarios
- Add test matrix aligned with documentation covering all supported Python constructs
- Include test cases for error handling and edge conditions with proper exception propagation
