For $25 and a single GPU, you can now run 100 experiments overnight without designing any of them. Karpathy open-sourced autoresearch. 42,000 GitHub stars in a week. Fortune called it "The Karpathy Loop." Every article about it focused on the ML angle. They all missed the bigger story. The pattern underneath works on anything you can score with a number. Ad copy, cold emails, video scripts, job posts, skill files. Three files. One the agent edits. One it can never touch. One instruction file…