🛡️ Sentinel: [CRITICAL] Fix Werkzeug Debugger RCE Exposure

[benpiper]

🚨 Severity: CRITICAL
💡 Vulnerability: Flask application bound to public interface (0.0.0.0) with debug=True
🎯 Impact: Exposed Werkzeug interactive debugger allows unauthenticated Remote Code Execution
🔧 Fix: Set debug=False when binding to 0.0.0.0 in both web_app/app.py and web_app/run.py
✅ Verification: Start the app via uv run web_app/run.py and verify the Werkzeug debugger is not exposed on error pages. Tests and linters pass.

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PR created automatically by Jules for task 6237572111630561723 started by @benpiper

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