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fix(promptguard): add safe device handling and stable model loading

  • Added _safe_move_to_device to gracefully handle NotImplementedError
    and unexpected errors during model.to(device)
  • Updated _pick_device to prioritize MPS → CUDA → CPU
  • Forced device_map=None, low_cpu_mem_usage=False, and
    torch_dtype=torch.float32 to avoid meta-tensor crashes
  • Improved logging for device fallback and Hugging Face model downloads
  • Ensured consistent behavior when loading models locally or from HF Hub

fix(promptguard): add detailed reason and score to jailbreak detection output

- Extended `get_jailbreak_score` to return both probability score and textual reason.  
- Added safe extraction with default fallback values to avoid crashes if fields are missing.  
- Improved logging for preprocessing and scoring stages.  

This change ensures downstream consumers (e.g., Promptfoo or LlamaFirewall API) can directly access structured `reason` and `score` without requiring a separate transform step.
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meta-cla bot commented Aug 21, 2025

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