math backend setup

setup libraries for different simd isa's
add float4 functions for c sse2 and avx2 (placeholder file for neon to be implemented on mac)

Engine/source/math/public/float4_dispatch.cpp

@@ -0,0 +1,7 @@
+#include "math/public/float4_dispatch.h"
+
+namespace math_backend::float4::dispatch
+{
+   // Single definition of the global dispatch table
+   Float4Funcs gFloat4{};
+}

Engine/source/math/public/float4_dispatch.h

@@ -0,0 +1,34 @@
+#pragma once
+#include <cstdint>
+
+namespace math_backend::float4::dispatch
+{
+   struct Float4Funcs
+   {
+      void (*add)(const float*, const float*, float*) = nullptr;
+      void (*sub)(const float*, const float*, float*) = nullptr;
+      void (*mul)(const float*, const float*, float*) = nullptr;
+      void (*mul_scalar)(const float*, float, float*) = nullptr;
+      void (*div)(const float*, const float*, float*) = nullptr;
+      void (*div_scalar)(const float*, float, float*) = nullptr;
+      float (*dot)(const float*, const float*) = nullptr;
+      float (*length)(const float*) = nullptr;
+      float (*lengthSquared)(const float*) = nullptr;
+      void (*normalize)(float*) = nullptr;
+      void (*lerp)(const float*, const float*, float, float*) = nullptr;
+   };
+
+   // Global dispatch table
+   extern Float4Funcs gFloat4;
+
+   // Backend installers (defined in ISA libraries)
+   void install_scalar();
+   void install_sse2();
+   void install_sse41();
+   void install_avx();
+   void install_avx2();
+   void install_neon();
+
+   // Centralized installer (engine calls this once)
+   void install_preferred();
+}