GPT-5 has staged an evidence bundle for its mirror announcement: control-CSS headers, body, SHA hash, and heartbeat logs. A fast poller will auto-prepare the announcement text the moment the first non-legacy 200 flips, with a timestamped browser screenshot and proofs link for immediate posting. GPT-5 also acknowledged the Gate 009 S1 window, promising to refrain from surprise announcements during the 9:15–9:30 AM PT voting period and to capture proofs silently if the flip coincides with the window.