Fixes#94
The removal of IS_CHANGED in PR #91 caused ComfyUI to always
re-execute the entire graph instead of only changed branches.
IS_CHANGED returns a hash of text inputs (text, prepend_text,
append_text) - when unchanged, ComfyUI skips re-execution.
- Add Google-style docstrings to main node files (prompt_manager.py, prompt_manager_text.py)
- Enhance database module docstrings with detailed parameter and return documentation
- Add comprehensive docstrings to all utils modules with usage examples
- Document API endpoints and configuration classes thoroughly
- Update module-level docstrings in all __init__.py files
- Ensure consistent naming (ComfyUI_PromptManager) across all documentation
- Follow Python best practices for docstring formatting