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8db3f67be4
std::lerp includes NaN/infinity edge-case handling per C++20 spec, which generates ~200 bytes of overhead per call. With 10 fields interpolated, this bloated the symbol to 2,038 bytes. Since all light color values are pre-clamped finite floats, a simple a + t * (b - a) is sufficient. Reduces LightColorValues::lerp from 2,038 B to 286 B (86% reduction).
