fix: remove static MainLight, increase LightBall intensity to 30, range 40

- Only one light source: the physics LightBall
- Intensity 30 (was 20), range 40 (was 30) for stronger illumination
- Static MainLight removed so renderer picks the dynamic ball

src/CortexEngine.App/Program.cs

@@ -264,16 +264,12 @@ class Program
             .Set(new Transform(Vector3.Zero, Quaternion.Identity, Vector3.One))
             .Set(grid);
 
-        world.Entity("MainLight")
-            .Set(new Transform(new Vector3(0, 8, 0), Quaternion.Identity, Vector3.One))
-            .Set(Light.Point(new Vector3(0, 8, 0), new Vector3(1.0f, 0.9f, 0.7f), intensity: 15.0f, range: 25.0f));
-
         var lightSphere = ProceduralMesh.CreateSphere(0.5f, 24, 12, new Vector3(1.0f, 0.9f, 0.7f));
         world.Entity("LightBall")
             .Set(new Transform(new Vector3(0, 15, 0), Quaternion.Identity, Vector3.One))
             .Set(lightSphere)
             .Set(RigidBody.DynamicSphere(0.5f, mass: 0.5f))
-            .Set(Light.Point(new Vector3(0, 15, 0), new Vector3(1.0f, 0.9f, 0.7f), intensity: 20.0f, range: 30.0f));
+            .Set(Light.Point(new Vector3(0, 15, 0), new Vector3(1.0f, 0.9f, 0.7f), intensity: 30.0f, range: 40.0f));
 
         var entityCount = 0;
         world.Each((Entity e, ref Transform _) => entityCount++);