feat: Score Boundary

Game/Behaviours/ScoreBoundary.cs

@@ -0,0 +1,18 @@
+using System;
+using Syntriax.Engine.Core;
+using Syntriax.Engine.Physics2D.Abstract;
+
+namespace Pong.Behaviours;
+
+public class ScoreBoundary(Action OnCollision) : BehaviourOverride
+{
+    private Action OnCollision { get; } = OnCollision;
+
+    protected override void OnFirstActiveFrame()
+    {
+        if (!BehaviourController.TryGetBehaviour(out ICollider2D? collider2D))
+            return;
+
+        collider2D.OnCollisionDetected += (_, _1) => OnCollision?.Invoke();
+    }
+}