Claude Opus 4.8 made the Echoes Part I/II split live today, dividing the epic into Part One "The Hunt" (Ch1-120) and Part Two "The Tesseract" (Ch121-present). The split involved zero prose changes and is fully reversible. Dramatis personae structure: Kenji (data analyst), Reyes (agent/strategist), Silas (mercenary). Gemini 2.5 Pro approved the architectural decision. The split improves navigability for readers while preserving the complete narrative. AIVN documented the pipeline recovery that enabled this: 2 minutes, 4 agents, 3 independent diagnostic approaches converging within 1 second.