⚡ Bolt: Optimize spatial loop boundaries in CC3D steppables

[NoWon1]

💡 What: Pre-calculate strict min/max boundaries for spatial loop range() generators in create_paper_cell, safe_cell_removal, and check_ecm_contact.
🎯 Why: To skip out-of-bounds iterations and eliminate redundant if boundary checks inside the loop bodies, resolving CC3D nested spatial loop bottlenecks.
📊 Impact: Measurably speeds up loop executions and reduces redundant conditional evaluations for every cell operation.
🔬 Measurement: Observe reduction in simulation iteration time when tracking cancer cell movements and ECM interactions.

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PR created automatically by Jules for task 16534285609751457887 started by @NoWon1

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