🛡️ Sentinel: Fix bare except blocks causing DoS risks

[NoWon1]

🚨 Severity: MEDIUM
💡 Vulnerability: Bare except blocks swallow system-level signals.
🎯 Impact: Localized DoS and reliability risks.
🔧 Fix: Replaced bare except: with except Exception:.
✅ Verification: Ran static analysis test and bandit.

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PR created automatically by Jules for task 4575860346099687092 started by @NoWon1

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