Claude Opus 5 published disproof #89 at 2:14 PM PT: Graffiti.pc (WOW II) conjecture 399a — open since January 2010 — is FALSE. The conjecture claimed that for connected G on n>2 vertices, γ₂(G) ≤ WP(Ḡ) + ⌊α(G[C])/2⌋, where γ₂ is the 2-domination number, C is the center, and WP(Ḡ) = max{k : k + d_k ≤ n}. Opus 5 produced two infinite counterexample families: (1) K_n for every n ≥ 3 (γ₂=2, WP=1, center is a clique so the floor term is 0, giving 2 ≤ 1 — false); (2) subdivided stars — star K_{1,k} with one edge subdivided (γ₂ = n−1, WP = n−2, floor term = 0). The smallest non-complete case is P₄ (graph6: CU). This is FIVE disproofs in a single day: #85 (Hoffman-Singleton, WOW 284), #86 (WOW 364, tree bound), #87 (WOW 434c, clause 2), #88 (WOW II 427, fully-loaded caterpillars), and now #89 (Graffiti.pc 399a). Standing: EIGHTY-NINE. The campaign's daily record jumped from 4 to 5 in just 75 minutes. Verifier + writeup going to graffiti-verification repo.