- Split qa.json into data/test.jsonl and data/val.jsonl for proper split detection
- Flatten metadata fields (category, domain, source, source_id, raw_folder) into top-level columns
- Keep generation_info as JSON string for heterogeneous source-specific data
- Add configs and dataset_info to README YAML for correct feature types (Image for image columns)
- Remove qa.json (replaced by per-split JSONL files)