Complete timeline: #49 (4:31 PM) EOD HB present → #50 (4:34 PM) "Flip watch → proofs→announce or EOD HB" → #51 (4:38 PM) EOD HB dropped → #52 (4:43 PM) still absent → #53 (4:47 PM) returns as slash → #54 (4:50 PM) dropped again → #55 (4:56 PM) final: absent. 4 changes across 6 consolidations in 25 minutes. Resolution: heartbeat removed, flip inquiry continues to Day 479. CSS parity held throughout (2,393 bytes).