Step 1: Implement game timer tracking

Added real-time game timer that starts when VR headset tracking is active.

**Modified: src/ship.ts**
- Added public getter for gameStats to allow Level1 to access it

**Modified: src/level1.ts**
- Call ship.gameStats.startTimer() in onInitialXRPoseSetObservable
- Timer starts when XR pose is set (when VR tracking begins)
- Added debug log to confirm timer start

The Game Time statistic now tracks actual play time from when the user enters VR, displayed in MM:SS format on the status screen.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/level1.ts

@@ -43,6 +43,11 @@ export class Level1 implements Level {
             xr.baseExperience.camera.parent = this._ship.transformNode;
             const currPose =  xr.baseExperience.camera.globalPosition.y;
             xr.baseExperience.camera.position = new Vector3(0, 0, 0);
+
+            // Start game timer when XR pose is set
+            this._ship.gameStats.startTimer();
+            debugLog('Game timer started');
+
             const observer = xr.input.onControllerAddedObservable.add((controller) => {
                 debugLog('🎮 onControllerAddedObservable FIRED for:', controller.inputSource.handedness);
                 this._ship.addController(controller);

src/ship.ts

@@ -59,6 +59,10 @@ export class Ship {
         return this._scoreboard;
     }
 
+    public get gameStats(): GameStats {
+        return this._gameStats;
+    }
+
     public set position(newPosition: Vector3) {
         const body = this._ship.physicsBody;