Enable matching files in the HuggingFace author index by SHA-256 in
addition to filename. Enrich the author index with hashes from repo
tree responses, store them in the index metadata, and use them as a
primary lookup path during search_huggingface_for_file before falling
back to filename-based search. Also update the author index cache
version to 2 and add tests for the new behavior.
Support both Comfy-Org and Kijai author indexes as known HuggingFace fallbacks, aggregate their status in the backend, refresh the cached author index, and update the frontend UI and tests.
Dariusz L