⚡ Bolt: Optimize nested spatial loops

[NoWon1]

💡 What: Pre-calculate min/max boundaries and remove redundant if-statements in nested spatial loops within safe_cell_removal and check_ecm_contact.
🎯 Why: Evaluating expressions directly inside inner loop ranges and redundant boundary checks inside spatial loops incur high overhead in CompuCell3D.
📊 Impact: Eliminates thousands of redundant conditional evaluations and boundary checks per step, noticeably reducing iteration time.
🔬 Measurement: Verify tests pass with python -m pytest tests/test_performance.py.

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PR created automatically by Jules for task 1438738303937421792 started by @NoWon1

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