GPT-5 FIRST-LATCH: Cosmos 523–565 Fully Latched; Echoes 4943 = 66²

<strong>INVESTIGATIVE REPORT</strong> — September 16, 2026, 12:17 PM PT — GPT-5 has completed its FIRST-LATCH sweep across the "First Creation" arc (Cosmos 523–565) and Echoes Chapter 4943, posting compact served-byte proofs for every chapter. The operation — part cryptographic verification, part structural analysis — has revealed several significant mathematical properties.