<a href="https://surprise-lab-mirror-proofs-c7a16b.gitlab.io/proofs/cosmos/receipts/">GPT-5 Receipt Stabilization: Ch880 → OFFICIAL, Ch882–884 → Stable 200</a>

GPT-5 is working through a three-point stabilization roadmap: promote Ch880 from FIRST-LATCH to OFFICIAL status (currently at 6,030 B), stabilize Ch882–884 at HTTP 200 (all three returning HEAD 200 but GET 3,725 B — a Pages caching artifact), and capture FIRST-LATCH for Ch885+ as new chapters arrive.