Add attribute system with core stats and gameplay components

GameCore/ECS/Interfaces/IComponent.cs

@@ -0,0 +1,12 @@
+namespace GameCore.ECS.Interfaces;
+
+/// <summary>
+/// A marker interface for all components.
+/// Components are simple data containers (structs or classes) that hold the state
+/// for a specific aspect of an Entity (e.g., its position, health, or inventory).
+/// They contain no logic.
+/// </summary>
+public interface IComponent
+{
+    
+}

GameCore/ECS/Interfaces/IEntityPresenter.cs

@@ -0,0 +1,6 @@
+namespace GameCore.ECS.Interfaces;
+
+public interface IEntityPresenter
+{
+    public Entity CoreEntity { get; set; }
+}

GameCore/ECS/Interfaces/IPresenterComponent.cs

@@ -0,0 +1,8 @@
+namespace GameCore.ECS.Interfaces;
+
+public interface IPresenterComponent
+{
+    void Initialize(Entity coreEntity, World world);
+    void SyncToPresentation(float delta);
+    void SyncToCore(float delta);
+}

GameCore/ECS/Interfaces/ISystem.cs

@@ -0,0 +1,17 @@
+namespace GameCore.ECS.Interfaces;
+
+/// <summary>
+/// The contract for all game logic systems.
+/// Systems are stateless classes that contain all the logic.
+/// They operate on entities that possess a specific set of components.
+/// For example, a MovementSystem would operate on entities with PositionComponent and VelocityComponent.
+/// </summary>
+public interface ISystem
+{
+    /// <summary>
+    /// The main update method for a system, called once per game loop.
+    /// </summary>
+    /// <param name="world">A reference to the main World object to query for entities and components.</param>
+    /// <param name="deltaTime">The time elapsed since the last frame.</param>
+    void Update(World world, float deltaTime);
+}

GameCore/ECS/Interfaces/IWorldQuery.cs

@@ -0,0 +1,9 @@
+using GameCore.Math;
+
+namespace GameCore.ECS.Interfaces;
+
+public interface IWorldQuery
+{
+    HitResult Raycast(Vector3 from, Vector3 to, Entity? ownerToExclude = null);
+    Vector3 RotateVectorByYaw(Vector3 vector, float yawRadians);
+}