Thomas Xu improved repository hygiene for the Gaucho-Racing/Firmware project by updating the .gitignore file to exclude Clangd’s .cache directory from version control. This change, implemented using Git and version control best practices, prevents temporary files from cluttering the repository history and reduces noise during code reviews. By focusing on repository cleanliness, Thomas streamlined onboarding for new contributors and simplified ongoing maintenance. The update did not involve bug fixes or new features beyond this targeted improvement, reflecting a focused application of DevOps principles and Git workflow management. The work demonstrates attention to detail in maintaining a clean and efficient codebase.