Report F1 on decontaminated test sets: 98.01 / 97.95

Release i60-p004: retrained stage-2 (60 iters, prune 0.04) — F1 98.00/98.06, 50MB

Update F1 to 97.70/97.48 (eval data normalized to PreSegment convention)

Document the retag2 segmentation convention in the model card

Rename models to wapic-cws{,-base}.wac and move files into model/

Rename base model to wapic-20260606-base.wac

Add wapic-cws release model (wapic-20260605=h25_30) + base + pattern

initial commit