🛡️ Sentinel: [CRITICAL] Fix bare exceptions swallowing system signals

[NoWon1]

🚨 Severity: CRITICAL
💡 Vulnerability: Bare except: blocks were used in multiple places within Simulation/CancerInvasionSteppables.py.
🎯 Impact: Bare exceptions catch all exceptions, including BaseException subclasses like KeyboardInterrupt and SystemExit. If caught silently in tight spatial loops, this prevents the simulation from being safely terminated by the user or OS, leading to localized Denial of Service (DoS) and application unresponsiveness.
🔧 Fix: Replaced all bare except: clauses with except Exception:, allowing critical system signals to propagate while still safely handling standard runtime errors. Also added an AST-based static analysis test (test_security.py) to ensure bare exceptions are not reintroduced.
✅ Verification: Ran bandit -r Simulation/ to ensure no bare exceptions exist, and executed PYTHONPATH=$(pwd) python -m pytest to confirm the new static analysis test passes and the build is stable.

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PR created automatically by Jules for task 11905615005010871084 started by @NoWon1

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