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* Add shallow fetch to improve performance for large repositories This change adds `--depth=1` to git fetch operations to perform shallow fetches instead of full history downloads. This significantly reduces checkout time for large repositories as reported in issue #52. Changes: - Line 55: Added --depth=1 to PR branch fetch - Line 102: Added --depth=1 to new branch fetch Fixes #52 Co-authored-by: ashwin-ant <ashwin-ant@users.noreply.github.com> * fetch 50 commits for PRs --------- Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com> Co-authored-by: ashwin-ant <ashwin-ant@users.noreply.github.com>