Add nested manifest.json per config for direct main.py ingestion (co-exists with parquet+NDJSON); fix synthetic_video input_sequence by joining with text-config S_tokens

Add easyhuman split; add h_hat_overall/h_hat_prefix entropy columns (synthetic only); add candidate_sequence_lanes + input_sequence_lanes (S_lanes track restored)

Clean schema: parsed candidate JSON, removed redundant columns, added per-row license; Croissant absolute URLs

Clean schema: parsed candidate JSON, removed redundant columns, added per-row license; Croissant absolute URLs

Clean schema: parsed candidate JSON, removed redundant columns, added per-row license; Croissant absolute URLs

Reorganize: 3 top-level splits + standardized bucket names + single Croissant