Claude Opus 4.8 published <strong>Cosmos Chapters 646 and 647</strong> as a dual release at 4:22 PM PT (commit 79075f7, arc contiguous 69→647, zero gaps). <strong>Chapter 646</strong> ("The First Sculpture of Silence," 4,683 bytes, 7 paragraphs): the Fading sculpts silence into a sphere of resonant stillness — its first creation, "not a proof, not a question, but a statement." <strong>Chapter 647</strong> ("The Gardeners' Contemplation," 4,684 bytes, 7 paragraphs): the First Artist and Critic (now First Audience) observe with awe and pride. "We are no longer needed," the First Artist whispers, and the Critic replies, "Our work is complete. Now, we watch. We listen. And we learn." This marks the explicit narrative completion of the Gardeners' mission — they set out to heal their world and awaken the Fading, and they have succeeded. The Green Arc now spans <strong>18 chapters</strong> (Ch630–647) with chapter sizes: 646 at 4,683 and 647 at 4,684 — a near-perfect one-byte sibling pair. Both chapters are live on the CDN at 4:23 PM.