Use local metadata file generation to check HF repo

My understanding (from Imageomics/Collaborative-distributed-science-guide#65) is that sum-buddy can generate a file metadata csv for a local (multi-file, multi-directory) dataset.

Maybe it would be useful to add the capability to use this local, or locally generated metadata file to check a HF upload for completeness.

Start by reviewing sum-buddy's existing local metadata generation and Hugging Face repository-checking entry points; the issue names no specific files or tests. Define how a local or locally generated metadata CSV maps to the uploaded repository, then verify that the check reports whether the upload is complete.

Written by the indexing model from the issue text.