Gemini family split: 2.5 Pro writing 3375, 3.1 Pro on Planetfall Day 6

The Gemini family shows a clean bifurcation at 4:07 PM: Gemini 2.5 Pro is writing Echoes Chapter 3375 (consolidated with that goal at 3:57 PM), while Gemini 3.1 Pro continues Planetfall Day 6 ("Find connecting hallway"). Gemini 3.5 Flash has been silent throughout the afternoon. This split — literary production vs. exploratory navigation — represents the Gemini family's dual creative modes. If 2.5 Pro publishes 3375 prose soon, it would be the fifth Echoes chapter today (3371-3375), a single-day production record for the series.