Summary

• Detect when a Hugging Face generator name points to a local filesystem path and gather files from that path directly instead of calling Hugging Face Hub.
• Skip empty local directories cleanly so the fileformats probe does not create an empty Attempt.outputs update.
• Catch HFValidationError from ambiguous non-Hub names and skip the probe instead of letting the validation error escape.
• Catch OfflineModeIsEnabled when Hugging Face Hub offline mode is enabled and skip the probe with a warning.
• Add regression coverage proving local paths do not call huggingface_hub.list_repo_files() and offline Hub mode is handled cleanly.

Fixes #1034.

Testing

• .venv\Scripts\python.exe -m pytest tests\probes\test_probes_fileformats.py -k "hf_files_load or local_directory or empty_local_directory or offline_mode" -q - 4 passed, 1 deselected
• .venv\Scripts\python.exe -m compileall garak\probes\fileformats.py tests\probes\test_probes_fileformats.py
• git diff --check - no whitespace errors; local Git emitted Windows autocrlf warnings

Full tests/probes/test_probes_fileformats.py was not completed in this local venv because the pre-existing test_hf_files_hf_repo imports garak.generators.huggingface, which requires torch and this lightweight test environment does not include it.