Extract player entity setup into a Player class

Moves the capsule/physics/renderable/PLAYER setup out of
overworldscene.js's inline init() into assets/scripts/Player.js so the
scene module just instantiates it.

assets/scripts/Player.js

@@ -0,0 +1,26 @@
+// Copyright (c) 2026 Dominic Masters
+//
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+// Player: dynamic capsule body, moved relative to the camera by PLAYER's
+// own update callback (see entityplayer.c).
+class Player {
+  constructor() {
+    this.entity = new Entity();
+
+    this.position = this.entity.add(POSITION);
+    this.position.setLocalPosition(0.0, 2.0, 0.0);
+
+    this.physics = this.entity.add(PHYSICS);
+    this.physics.setShape(PHYSICS_SHAPE_CAPSULE, 0.5, 0.5);
+
+    this.renderable = this.entity.add(RENDERABLE);
+    this.renderable.setMesh(0, MESH_CAPSULE);
+    this.renderable.setColor(0, 0, 255, 255);
+
+    this.entity.add(PLAYER);
+  }
+}
+
+module.exports = Player;

assets/scripts/overworldscene.js

@@ -12,6 +12,8 @@ var CAMERA_ORBIT_RADIUS = 18.0;
 var CAMERA_ORBIT_HEIGHT = 10.0;
 var CAMERA_ORBIT_SPEED = 0.5;
 
+var Player = require('./Player.js');
+
 var cameraOrbitAngle = 0.0;
 var cameraPosition = null;
 
@@ -55,20 +57,7 @@ module.exports = {
     planeRenderable.setMesh(0, MESH_PLANE);
     planeRenderable.setColor(128, 128, 128, 255);
 
-    // Player: dynamic capsule body, moved relative to the camera by
-    // PLAYER's own update callback (see entityplayer.c).
-    var player = new Entity();
-    var playerPosition = player.add(POSITION);
-    playerPosition.setLocalPosition(0.0, 2.0, 0.0);
-
-    var playerPhysics = player.add(PHYSICS);
-    playerPhysics.setShape(PHYSICS_SHAPE_CAPSULE, 0.5, 0.5);
-
-    var playerRenderable = player.add(RENDERABLE);
-    playerRenderable.setMesh(0, MESH_CAPSULE);
-    playerRenderable.setColor(0, 0, 255, 255);
-
-    player.add(PLAYER);
+    new Player();
   },
 
   // Called once per engine frame while this module is the active scene