- Add TestArgumentSeparator class with 8 tests verifying that script
arguments must come after '--' separator
- Update create and edit command docstrings with examples showing
correct usage of '--' separator
- Update argument help text to indicate "(must come after '--')"
- Add "Passing Arguments to Your Script" section to README
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>