During October 2024, Chris Karwin focused on repository hygiene for the cositools/cosipy project by addressing technical debt and improving maintainability. He identified and removed the deprecated continuum_BG_estimation_basic_algorithm.ipynb tutorial, streamlining the repository and reducing obsolete artifacts that could hinder onboarding for new contributors. Using Python and leveraging his skills in data cleaning and file management, Chris ensured that the cleanup was traceable and limited to a single, well-documented commit. While the work did not involve new feature development, it demonstrated careful attention to codebase quality and maintainability, laying a cleaner foundation for future enhancements and collaborative development.