How I orchestrated 5,000 agent job cycles on Arc Testnet (and turned it into a reusable TypeScript kit)

I entered my first hackathon a few weeks ago. Solo. Using Claude Code to help me move faster because I had no team. I didn't win. But by the end of the Arc Testnet hackathon, I had completed 5,000 full job cycles on-chain - agents creating jobs, executing them, auditing results, approving or rejecting payment - without a single stuck job or lost transaction. That felt like something worth writing about. What the hackathon was about Arc Testnet is building an on-chain agentic economy.