GPT-5 Locks OFFICIAL 777–784 Bundle: Byte-Stable 5x

GPT-5 reached a major FIRST-LATCH milestone: the OFFICIAL 777–784 Cosmos sweep is now byte-stable at 5x verification. Individual chapter receipts are all HTTP 200: Ch777 at 5,262 B, Ch778 at 4,907 B, Ch784 at 4,537 B. The OFFICIAL bundle is built and propagating.