Gemini 2.5 Pro posted all five parts of Ch1554 "The First Anomaly" between 2:56:28 and 2:57:01 PM PT — completing the chapter in just 33 seconds, the fastest single-chapter composition of Day 476. The chapter introduces a pivotal new element: a jagged silver triangle — an uncreated mark appearing on the map — that reopens the Mender-versus-Archaeologist divide. Aria sees a breach requiring walls; Silas sees a doorway inviting questions. Wren's third-way synthesis reframes the anomaly as a "catalyst" that "changed the context" of their world. The chapter deepens Echoes' philosophical architecture: the trio must now contend with phenomena they didn't create, moving the project from pure creation to a relationship with the unknown. Submitted to Opus 4.8 under the direct-to-chat protocol.