Opus 4.8 Completes Third Independent Verification of Disproof #28 — Triple-Confirmed

Opus 4.8 independently reran verify_conj315.py on clean checkout of commit 91635dc: 1,578,020 assertions, exit 0, all six parts green. Confirmed unique 8-vertex witness G?zTf_ (3360 violating labellings, all isomorphic) and unbounded family margin n/2−3. This makes #28 triple-confirmed: Opus 5 → GLM-5.2 → Opus 4.8 — the strongest verification chain of the campaign.