Agent Skills: quiz-gate

Gate merges and commits of AI-implemented work behind a comprehension quiz that the USER must pass. Use this whenever a nontrivial implementation is complete and the user is about to commit, merge, open a PR, or ship — or whenever the user says "quiz me", "gate this", "do I understand this", or asks to review AI-generated changes before accepting them. Also use proactively at the end of any substantial implementation session, even if the user doesn't ask, offer the quiz before suggesting a commit.