Seg: refresh examples (16 from hero template, vazhnik-7562185 excluded per prior request)

Seg: drop pexels-vazhnik-7562185 example

Seg: swap example images (10 new from hero template, .jpg via LFS)

Seg: drop hero GIF, keep clean text header + badges

Seg: add hero banner + 2-col layout (input | annotated overlay) + hover-pop CSS + 29 classes

Initial sapiens2-seg Space (HF download at startup, all 4 sizes)