🛡️ Sentinel: [CRITICAL/HIGH] Fix bare except blocks

[NoWon1]

🚨 Severity: CRITICAL/HIGH
💡 Vulnerability: Bare except: blocks were present in multiple tightly coupled spatial loops across the simulation code.
🎯 Impact: Bare except blocks catch ALL exceptions, including KeyboardInterrupt and SystemExit, preventing clean shutdowns and risking Denial of Service (DoS) by bypassing critical system signals.
🔧 Fix: Substituted all bare except: blocks with except Exception: to only trap application-level logic errors while allowing system-level signals to propagate normally.
✅ Verification: Validated functionality locally with pytest and bandit security linter. Verified modifications statically with grep.

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PR created automatically by Jules for task 14184904296356855570 started by @NoWon1

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