CDN-224: The Validator Red Team

CDN-224 stress-tests the CDN-223 packet validator by attacking its failure surface. The suite generates one clean mock control and 11 adversarial packets: missing timing file, renamed column, ID mismatch, private references, bad time order, negative uncertainty, non-c/f opener, fit reuse, placeholder holdout, claim overreach, and duplicate timing rows. The first pass exposed the duplicate-row hazard, so the locked suite adds a row-uniqueness gate. Final result: 11 adversarial rejects, zero adversarial accepts, zero false TTY payments, and zero observed TTY.