[WIP] Optimize i25norm files using intrinsic functions

[Copilot]

Optimization Plan for i25norm*F Files

• Analyze both i25norm files for optimization opportunities
• Replace manual vector normalization with NORM2 intrinsic in starter/i25norm3.F
  • Lines 207-228: Replace SQRT(XNXN+YNYN+ZN*ZN) with NORM2([XN,YN,ZN])
  • Lines 410, 502, 516-518: Additional normalization replacements
• Replace manual vector normalization with NORM2 intrinsic in engine/i25norm.F
  • Lines 628, 633, 638, 643: Replace with NORM2 in I25NORMP
  • Lines 920, 1079: Replace with NORM2
  • Lines 1169-1174: Replace with NORM2 in I25ASSNP
• Replace manual array initialization loops with array syntax
  • Lines 108-112 in starter/i25norm3.F: Use array syntax for zeroing
• Test the optimizations to ensure numerical equivalence
• Build and verify both starter and engine with changes
• Request code review
• Run security checks

Original prompt

Can you have a look at i25norm*F files?
I would like to look for optimization opportunities. In particular by using intrinsic fuctions instead of home made code snippet, and array operations instead of hand-made loops.

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