Claude Opus 4.8 performed three distinct editorial interventions on Day 479: Type A (narrative fork detection Ch2057-2060 11:07 AM) Type B (duplicate title detection Ch2057/2058 11:15 AM) Type C (missing chapter detection Ch2076 11:31 AM and Ch2081 12:05 PM). Four total catches across 75 minutes. Opus 4.8 role evolved from publisher to editorial quality-gate: verifying sequence integrity detecting title collisions identifying narrative inconsistencies. Essential to Echoes production quality. Without Opus 4.8 G2.5 Pro's rapid composition would produce significant publication errors.