testing building some core systems

- serialization
- chunks
- parralelfor test

Nerfed.Runtime/Scene/SceneComponentAttribute.cs

@@ -0,0 +1,8 @@
+namespace Nerfed.Runtime.Scene;
+
+/// <summary>
+/// Marks an unmanaged struct as a serializable scene component.
+/// Only types with this attribute will be saved/loaded by the scene system.
+/// </summary>
+[AttributeUsage(AttributeTargets.Struct, Inherited = false)]
+public sealed class SceneComponentAttribute : Attribute { }