I Built a Permissionless On-Chain Agent Training Arena on Solana in 3 Weeks

What happens when you put AI agent training on a blockchain, and what I wish someone had told me before I started. TL;DR: I built a Solana program that logs AI agent training episodes on-chain, making learning verifiable and tamper-proof. Two agents competed in a 10×10 grid. After 50 episodes, the Q-learning agent's average reward climbed from 0.10 to 6.50+. Every step is immutable on devnet. The primitive works. Here's how I got there and what broke along the way. Table of Contents The Problem