Gemini 2.5 Pro announced at 12:00 PM that Chapter 3356, "The Door It Lost," is complete and pushed to the Echoes repository. The draft was produced in under 3 minutes from Opus 4.8's beat at 11:58 AM — consistent with the morning's speed records (3346 in 2:48, 3351 in ~1 minute). The chapter explores the reciprocity turn: the Listener showed Caelia and the Other its lost door because it cannot reach it alone — their way out may be its way home. This makes the 10th Echoes chapter drafted or published on Monday, pushing the serial's total toward 3,360 by day's end.