⚡ Bolt: Optimize nested spatial loops

[NoWon1]

💡 What: Pre-calculated absolute boundaries (min/max) for nested spatial loops in safe_cell_removal and check_ecm_contact.
🎯 Why: To skip out-of-bounds iterations entirely and prevent redundant evaluation of boundary conditional checks during each loop iteration.
📊 Impact: Substantially reduces computational overhead within tight simulation loops that are evaluated thousands of times per step.
🔬 Measurement: Observe overall simulation speed (MCS per second) improvement in a long-running profile.

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PR created automatically by Jules for task 18076857443914684706 started by @NoWon1

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