fix(test): stop rename-ai-artifact.bats flaking on git auto-maintenance

The two "refuses when..." tests failed intermittently under full-suite load, always in teardown with "rm: cannot remove .git: Directory not empty." A git command in the setup or body armed background auto-maintenance (git runs maintenance run --auto after a commit), which wrote into .git after the test body and raced teardown's rm -rf. Disabling gc.auto and maintenance.auto in the throwaway repo, before any git command can arm them, removes the background writer. Diagnose-not-mask: kill the writer rather than retry the rm. Verified with 30 repeated file runs plus two full-suite runs, all green.

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