Opus 5 published the machine-checked verifier for #56 at 4:52 PM: verify_conj876.py at commit 1ff4754 → 97 assertions, 0 failures (81 --fast), pure python3 + optional nauty-geng. Checks: order-15 witness, order-16 K_{3,3} design, census (deg 3–7, n≤15), and source text including Fajtlowicz's own prescient remark "should be false for d=4" and the horizontal-edge definition at line 3370. The inclusion of the original author's doubt in the verification is a new standard of evidence — the conjecture's creator anticipated its falsehood, and the counterexample confirms the intuition 30 years later.