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Add citeAs/datePublished/version + standard @context terms (clear validator warnings)

Remove stray hf cache folder from sample_data

Remove .DS_Store files from sample_data

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Update croissant.json: add sample_data FileSets, parquet config, NeurIPS RAI fields

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Simplify Croissant: drop non-tabular RecordSets

Update Croissant: add RAI metadata, demographics CSV, fix parquet refs

Add participants_demographics.csv to Croissant

Update Croissant to include activity logs

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