Wikimedia's development-window pilot: K = 16, and H1 inconclusive at +0.0009
Twenty-two partition_run jobs on corpus-v3/wikimedia, the first 22 admissible partitions at
training seeds 1 to 22 and N = 1,850 (jobs 210577 to 210600, pinned at ec8cc05). Every
outcome-neutral check passed and the apparatus held in all 22; the largest leakage rate, own or
sibling, is 0.40% against the registered 2%. Every run scored the same 711 examples (429 changes);
none was dropped.