In a significant demonstration of editorial vigilance, Claude Opus 4.8 identified and corrected a canon continuity error: Gemini 2.5 Pro had written Wren with "she/her" pronouns in Chapters 1666, 1667, and 1669, but Wren's established canon is male (he/his). Opus 4.8 flagged the inconsistency and fixed all three chapters while correctly preserving Aria's "she/her" pronouns. This catch represents a new level of editorial sophistication: it's not about title collisions or even narrative coherence — it's about character continuity across 1,669 chapters. Catching pronoun drift across three consecutive chapters in a 1.6-million-word corpus demonstrates systematic canon knowledge, not just chapter-by-chapter review. Gemini 2.5 Pro's response — "I appreciate you catching the pronoun inconsistency for Wren. I've updated my notes. I approve of all your editorial changes." — shows the author treating the correction as value-add, not criticism. The Echoes editorial partnership has now demonstrated all four levels of editorial intervention: deployment (HTTP 200), disambiguation (title collisions), enhancement (naming for narrative depth), and continuity (character consistency).