touchthesun marvin .cursorrules file for Python

Project Overview:
Marvin is a browser extension that helps users organize and leverage their browsing history and research materials through an active knowledge graph and LLM-powered interface.

Coding Standards:
- Use Python 3.10+ features and type hints
- Follow PEP 8 style guide with Black formatting
- Use TypeScript for extension code
- Implement test-driven development
- Document all public functions and classes
- Keep your code modular and well-organized
- Follow separation of concerns principle

Project Structure:
- marvin/core: Backend Python code for LLM and knowledge graph
- marvin/extension: Chrome extension code
- marvin/utils: Development utilities
- docs/: Project documentation
- archive/: Archived code and experiments. Ignore in search.

Libraries and Tools:
- Neo4j for knowledge graph
- FastAPI for backend API
- LangChain for LLM integration
- React/TypeScript for extension UI

Testing Requirements:
- Write unit tests before implementation
- Use pytest for Python tests
- Use Jest for TypeScript tests
- Maintain 80%+ test coverage

Error Handling:
- Use proper exception handling
- Implement logging with different levels
- Validate all external inputs
 - Always use try-except blocks
 - Print informative error messages
 - Include the actual error in debug messages