Ancilo 0.3.1

• Fixed: a loaded model was lost when its conversation grew – "needs about 41.6 GB, but only about 33 GB are free" on a Mac with 128 GB. Ancilo counted only "free" memory, not the file cache macOS hands back at once (where a stopped model's memory lands, too). It now counts what macOS gives a program, and a model whose larger context does not start always comes back as it ran (unless memory is critically short).