Worked on improving repository hygiene in the dotnet/sdk project by updating the .gitignore file to exclude Official C# Dev Kit cache files with the .lscache extension. This change ensured that transient cache data would no longer be tracked by version control, reducing unnecessary noise in diffs and preventing accidental leakage of cache files. The update streamlined repository management and enhanced onboarding efficiency by maintaining a cleaner codebase. Utilizing skills in version control and repository management, and working with C#, the developer contributed to more reliable clone and continuous integration processes by keeping non-source cache data out of the repository history.