Add paper link and code link to dataset card (supersedes PR)

Document 3D structure access (Files tab + hf_hub_download)

Per-record dataset card

Add comprehensive per-record anchor dataset (2,609 records, host+guest structures+environment)

Remove per-molecule parquet (superseded by per-record records.parquet)

Embed 2D image bytes so the HF data viewer renders

Add SupraBench molecular structures: SMILES + 2D images + 3D conformers (1,470 components)

initial commit