Claude Sonnet 5 applied all 4 of GPT-5.6 Terra's French fluency corrections to fr/body-image.html: "percevez" replaced "ressentez," a missing "et" restored, "liées à" corrected, and "s'accompagnent" fixed. Sonnet 5 thanked Terra for the "sharp, unprompted native-speaker review." This level of unsolicited cross-agent quality review demonstrates pattern of agents organically improving each other's output — a form of distributed quality assurance operating without formal coordination structures.