Revert model card to v7 + changelog note

Revert weights to v7 (v13 regressed on real-world layered artwork)

Update weights to v13 (soup of the v9 and v13 checkpoints)

Update model card for v13

v7: print-design/sticker category (fixes #2) — design 2x better than all measured rivals; overall now leads every model tested

v7 numbers

v6: edge-crop + mixed-opacity training (fixes #1 — solid parts of transparent objects, frame-cropped subjects)

v6 benchmark numbers

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initial commit