Run an automated code review of unstaged changes using Codex CLI, then fix issues and re-review in a loop until approved. Use when the user asks to review changes with Codex, run a code review cycle, or invokes /codex-code-review.
Automated review loop: run Codex review on unstaged changes, apply fixes, re-review until clean.
git diff. If empty, report "No unstaged changes to review" and stop.codex review --uncommitted