feat: add safetensors loader for structural integrity analysis

[GangGreenTemperTatum]

Summary

• Adds a new safetensors loader that performs static security analysis of .safetensors files without loading model weights into memory
• Validates header structure (header bombs, truncation, invalid JSON), tensor layout (overlapping byte ranges, out-of-bounds offsets, shape/size mismatches), and metadata (non-string values, URLs, base64, oversized entries)
• Adds view_extra() dispatcher to view.py with safetensors-specific rendering (file structure, tensor summary, metadata, color-coded findings)

Test plan

• poetry run ruff check dyana — lint clean
• poetry run ruff format --check dyana — format clean
• poetry run mypy --ignore-missing-imports --no-error-summary dyana — type check clean
• poetry run pytest dyana -v — 189 tests pass (19 new safetensors tests + 7 new view_extra tests)
• CI pipeline passes

🤖 Generated with Claude Code

Generated Summary:

• Added support for SafeTensors model files into the Dyana sandbox environment.
• Implemented a new loader for analyzing SafeTensors files, including validation of header integrity and tensor analysis.
• Enhanced the README to mention support for SafeTensors files in the description.
• Refactored CLI code to include a view for the new loader and added error handling for device driver selection.
• Introduced several tests for the new SafeTensors functionality, ensuring validation and analysis processes are working as expected.
• New files added:
  • loader.py for SafeTensors processing.
  • main.py for executing the SafeTensors analysis with command-line arguments.
  • Dockerfile and requirements for building the SafeTensors environment.
  • .gitignore for untracked files specific to SafeTensors.
• The implementation focuses on ensuring structure and integrity while analyzing SafeTensors files, potentially improving user trust in model file validation.

This summary was generated with ❤️ by rigging