Restore variant parquet files removed by DatasetDict.push_to_hub

Standardize train/test splits: lift dynamic version key into a `version` field

Upload train_diff_docstring.parquet

Upload train_docstring_grpo.parquet

Delete data/train_docstring_grpo.parquet

Upload train_docstring_grpo.parquet

Rename data/train.parquet to data/train_code.parquet

Rename data/test.parquet to data/test_code.parquet

Upload 2 files

Restructure