A parser patch lands in review at 02:11. Twelve tests sit green beside the diff. Coverage rises nine points before dawn. Two days later a trailing delimiter returns None in production. The agent shipped code and tests together. Reviewers saw one color only. Green never proved the new behavior. It only proved the suite agreed with itself. A lock is not proven by a key you just cut. You prove it by pulling the bolt. The door must swing open. Agent tests need the same motion. Keep the new tes...