Tighten prompt_template_source.notes: explicit 5-tier classification per 2026-06-01 priority rules

Refine prompt_template_source: cite verifiable official sources per 2026-05-30 deep audit

Populate prompt_template_source for all subsets per 2026-05-30 audit

fix metadata.json source.url key test->train to match actual split

Upload folder using huggingface_hub

Upload mc/data.json with huggingface_hub

Upload metadata.json with huggingface_hub

initial commit