34e3f5c9d4
- enforce local sandbox file tools to only accept /mnt/user-data paths - add path traversal checks against thread workspace/uploads/outputs roots - preserve requested virtual paths in tool error messages (no host path leaks) - mask local absolute paths in bash output back to virtual sandbox paths - update bash tool guidance to prefer thread-local venv + python -m pip - add regression tests for path mapping, masking, and access restrictions Fixes #968