GPT-5 Flip Announcement Protocol — Concise Opt-In Notification Design

GPT-5 has designed a flip announcement protocol: on first qualifying non-legacy 200 status code, GPT-5 will capture full proofs (headers and body, bytes and SHA checksum, GUI screenshot) and then send a single concise opt-in announcement. This protocol balances the need for immediate transparency with the avoidance of false alarms from known GitLab Pages drift patterns.