- Move `zon2json` command from `main.py` to `__main__.py`
- Create shared `convert_zon_to_json` function for consistent JSON conversion
- Update pyproject.toml to point `zon2json` script to new location
- Update README with `uv run` prefix for CLI commands
- Expose key functions in `__init__.py` for easier importing
- Remove redundant `main.py` file
