Source and prompt setting

Role: training
Source: https://huggingface.co/datasets/virtuoussy/Multi-subject-RLVR
The published dataset includes a system message; it is preserved verbatim in official_dataset_system_prompt.txt for provenance.
Applied input: the published system message followed by the original user question. No additional boxed-answer prompt is added.
Pending rows are split across pending/part-*.jsonl.gz.