Optimize hot paths in geodesic ray tracing with ipow template function#2

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Copilot wants to merge 11 commits intomainfrom

copilot/fix-performance-bottlenecks

Commits on Jan 27, 2026

Initial plan
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Optimize critical performance bottlenecks

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Optimize more metric implementations (Kerr, Morris-Thorne)

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Optimize ODE error controllers and ray tracer lambda capture

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Fix code review issues - correct geodesic loop and remove duplicate tanh computations

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Performance optimization complete

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Implement ipow template function for better intent clarity

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Use pre-computed speed_of_light_squared constant in alcubierre metric

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Remove single-use temporary variables for better code clarity

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Fix undefined variable references in kerr metric

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Fix alcubierre metric calculations after refactoring

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