🛡️ Sentinel: Fix error detail leakage in login_required decorator

[Pmaster-dev]

🚨 Severity: MEDIUM

💡 Vulnerability

auth/utils.py previously included str(e) in the 401 Unauthorized response body when authentication failed in the login_required decorator.

🎯 Impact

Exposing exception details can leak database state, internal system information, stack frames, or connection details to unauthenticated attackers.

🔧 Fix

• Updated login_required to log the authentication error internally on the server side using standard logger.error.
• Sanitized the JSON response to return {"error": "Unauthorized"} without leaking internal exception details.
• Added unit tests in tests/test_auth_utils.py verifying that exception details are omitted from the response.

✅ Verification

Ran PYTHONPATH=.:src python3 -m pytest (3 passed) and PYTHONPATH=src pylint src/automation src/handoff auth --fail-under=7.0 (rated 7.98/10).

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PR created automatically by Jules for task 12957691815833607693 started by @Pmaster-dev

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