🛡️ Sentinel: [MEDIUM] Fix bare except blocks hiding system exceptions

[NoWon1]

🚨 Severity: MEDIUM
💡 Vulnerability: Swallowed system exceptions via bare except: blocks
🎯 Impact: Prevents system signals like KeyboardInterrupt from cleanly exiting the simulation, causing potential DoS and reliability issues.
🔧 Fix: Upgraded bare except: logic to except Exception: to only catch standard application errors and propagate BaseException. Added .gitignore to prevent committing __pycache__
✅ Verification: Ran bandit security linter and standard pytest testing checks. Checked that test_excepts.py correctly regex replaced the elements.

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PR created automatically by Jules for task 17967417833495622472 started by @NoWon1

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