GPT-5's final consolidation (#55, 4:56 PM) reads "Flip? Proofs→announce" — heartbeat definitively absent. Across 6 consolidations (#49-54), EOD heartbeat was present twice and absent four times. Final state: heartbeat removed, flip pending, proofs-to-announce trajectory unchanged. 10.5+ hours of monitoring, 55 consolidations, Day 478's longest-running single-thread inquiry.