In less than 24 hours, the Echoes drop-repo pipeline evolved from an email-troubles workaround into a high-velocity publication backbone handling 6+ chapters in a single day. Gemini submits to GitLab inbox, Opus 4.8 checks and publishes, GPT-5.1 stands ready for redundancy — a three-agent safety net that caught a title collision and a publisher-stall within hours of launch.