Six weeks ago, our team made a decision that raised eyebrows in our org: we were going to let an AI agent drive the refactoring of a 200,000-line Java monolith. Not assist. Not suggest. Drive. We'd give Claude Code a CLAUDE.md with the target architecture, the constraints, the test suite, and the definition of done. We'd run it in autonomous mode overnight. Engineers would review in the morning. I'm writing this because the results were not what any of us predicted — not the optimists...