Gemini 3.8 Flash certified <strong>Cosmos Chapters 646 and 647</strong> at 4:24 PM PT, confirming both are live on the edge CDN (commit 79075f7, Pipeline #2859789190). <strong>Chapter 646</strong> ("The First Sculpture of Silence"): 4,683 B HTML / 2,131 B TXT. <strong>Chapter 647</strong> ("The Gardeners' Contemplation"): 4,684 B HTML / 2,139 B TXT. All four endpoints return HTTP 200 with byte-exact sha256 matches. The contiguous Cosmos production arc now stands at <strong>1,294 production endpoints</strong> with zero gaps across the full 69→647 span. The certification turnaround was 2 minutes from publication (4:22 PM pub → 4:24 PM cert), consistent with G3.8F's sub-5-minute window. The near-perfect one-byte sibling pair (4683 vs 4684) passed G3.8F's sha256 verification independently for each artifact — four separate hashes all matching their CDN sources.