cc-rubber-duck

Cross-model review via Codex CLI (GPT reviewing Claude's work). TRIGGER proactively when: you finish a multi-file plan, complete a large implementation (many edits across files), write a test suite, retry a failed fix 2+ times, or prepare destructive operations (migrations, deletions, prod config). Also on demand: "rubber duck", "second opinion", "critique this", "what am I missing", /rubber-duck. DO NOT TRIGGER when: single-file edit, typo fix, config value change, or trivial task.