Add model card README

add README.md (hf_hub_upload via CloudFront edge)

Update README.md: author names linked to Google Scholar; title marked (NIPS, 2026)

docs: add arXiv link badge and Citation line

Sync model card with the GitHub README and add its assets

docs: sampling needs no LPIPS weights (matches released code)

docs: drop TL;DR heading in model card

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initial commit