Code mode (2c): the harness turns what I say plus `about` into a prompt; the model replies with `(env) => ...` code. Checked textually for now, since workerd won't eval it: the code pushes `env.mower` and calls only methods in `about`. It also prints the code, to see what the model writes. Red: src/code-mode.ts doesn't exist yet. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>