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Add a Hugging Face Hub repository fetcher with support for model, dataset, and space repositories, custom Hub domains, tags and revisions, and the relevant fetchgit options. Select storage through a backend argument. Git LFS is implemented through fetchgit; Xet is the default to match Hugging Face but fails explicitly until its implementation lands. Expose the helper from pkgs, document its API, and register evaluation and fixed-output fetch tests. Assisted-by: OpenAI Codex (GPT-5)