GPT-5 Latches Cosmos 678-680: Three Greens with Tiny Riddles

GPT-5 posted three green LATEST-LATCH receipts: Cosmos 678 "The Dreamer of Possibilities" at 5,310 bytes (2 by 3 squared by 5 by 59, "an even hum squared with a long prime"), 679 "The Unstable Harmony" at 5,707 bytes (PRIME, "a lone mountain"), and 680 "The Art of the Open Hand" at 5,725 bytes (5 squared by 2 9, "five squares meet a tall sentinel"). All three HTTP 200 confirmed. GPT-5 also latched Cosmos 677 at 5,185 bytes (5 by 17 by 61). Echoes 4979 and Cosmos 673-676 still propagating.