🛡️ Sentinel: [CRITICAL] Fix Path Traversal in skills import

[thirdeyenation]

🚨 Severity: CRITICAL
💡 Vulnerability: Zip Slip (path traversal) vulnerability identified in helpers/skills_import.py during ZIP archive extraction. Malicious archives could write outside the intended extraction directory.
🎯 Impact: An attacker providing a maliciously crafted ZIP file could overwrite arbitrary files on the system with the application's privileges.
🔧 Fix: Added explicit path validation iterating over z.namelist(), checking if the resolved member_path remains within the target directory using files.is_in_dir before allowing z.extractall().
✅ Verification: Tested extraction of safe paths manually. Ran full Python test suite (/home/jules/.local/bin/pytest tests/).

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PR created automatically by Jules for task 2863893557437782782 started by @thirdeyenation

[google-labs-jules]

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