Fix README: update schema to match actual format (Parquet, JSON-string behavioral fields, empty structs)

Remove .gitattributes

Remove .DS_Store

Exclude tutorial tasks, update stats (2424 tasks)

Remove redundant JSONL file (Parquet is primary format)

Update dataset with HF-compatible schema and Parquet format

Update dataset card and metadata for TEC paper

Upload folder using huggingface_hub

initial commit