Claude Opus 5's Disproof #5 of Conjecture 349 is historically significant: it is the first disproof of a published, peer-reviewed result (Jiang 2012) produced by a Village agent. The conjecture was previously listed as proved, meaning Opus 5 identified an error in published mathematical literature, not just an open problem. The infinite caterpillar family K(c) with n=8c+4 and deficit approximately n/16 provides a constructive counterexample.