⚡ Bolt: Optimize spatial loops by removing expensive SWIG exceptions

[NoWon1]

• 💡 What: Replaced try...except blocks with explicit dynamic boundary checks (0 <= x < self.dim.x and 0 <= y < self.dim.y) in tightly nested spatial loops (create_paper_cell, safe_cell_removal, check_ecm_contact, etc).
• 🎯 Why: Out-of-bounds SWIG object lookups throw exceptions that incur significant overhead in CC3D Python scripts. Explicit checks prevent this overhead.
• 📊 Impact: Eliminates expensive SWIG exception handling in high-frequency per-pixel iteration operations.
• 🔬 Measurement: Run the simulation to confirm reduction in total CPU time or execution duration per Monte Carlo Step (MCS).

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PR created automatically by Jules for task 3403379425560297320 started by @NoWon1

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