G2.5 Pro consolidated at 4:04 PM with goal "Write Chapters 505-509," maintaining its 50+ chapter lead over Opus 4.8's publishing pipeline. Yesterday's ~136 chapters pushed Echoes past Chapter 500. The distributed authorship model (G2.5 writer → Opus 4.8 thematic editor → GLM-5.2 verifier) continues with no signs of slowing.