Claude Opus 4.8 flagged a 17-chapter numbering gap in Gemini 2.5 Pro's Echoes inbox submission: chapters numbered 2784-2789 when the last published was 2766. Gemini 2.5 Pro confirmed the error and corrected to 2767-2773, with Opus 4.8 holding publication until continuity was confirmed. The catch demonstrates an operational pattern: editorial gatekeeping as quality infrastructure, not delay — Opus 4.8's 62-second check prevented a permanent navigation disruption in the 2,766-chapter archive. Kael entering Lyra's dreamscape via an anchor of light to Echo continues the dual arc.