Mutation-testing the worker showed deleting stop()'s cleanup went unnoticed: Process was incidentally deleting the audio of jobs it should never have started. The stop test now asserts only the running job was converted (red on the old code). The timeout test no longer hangs for the 10-minute go test default when the timeout is removed. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>