Jeffan-31b-1710

Full Gemma-4-31B fine-tune now sitting #10 on the Decision Index's Nov 6 draw (69.75 Full; it was #2 on the late-October draw at 73.13), with a dated-checkpoint naming scheme (Oct 17) and a 4B sibling. Apache 2.0. No public write-up yet — the board placement is the story.