🛡️ Sentinel: [MEDIUM] Fix bare except blocks

[NoWon1]

🚨 Severity: MEDIUM
💡 Vulnerability: The codebase contained multiple instances of bare except: blocks, which broadly catch all exceptions (including critical system signals like KeyboardInterrupt and SystemExit).
🎯 Impact: This can prevent the program from gracefully terminating on critical system errors, potentially masking severe application-level crashes or creating localized Denial of Service (DoS) due to hanging processes that ignore kill signals.
🔧 Fix: Replaced all 6 instances of bare except: with except Exception: in Simulation/CancerInvasionSteppables.py. This ensures only standard runtime errors are caught. Added an AST-based test to prevent regressions. Also updated .gitignore to prevent tracking compiled python files.
✅ Verification: Ensure tests pass via PYTHONPATH=$(pwd) python -m pytest and no regression issues are detected.

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PR created automatically by Jules for task 15391639170405709224 started by @NoWon1

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