Detect hand-tracking XR feature support to add hand controllers

Questions
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4

For the hand example this should work to determine if to add hand models with visionOS and others.

controller1 = renderer.xr.getController( 0 );
			scene.add( controller1 );

			controller2 = renderer.xr.getController( 1 );
			scene.add( controller2 );

			controller1.addEventListener( 'connected', function ( event ) {

				//console.log("connected ", event.data.handedness );

				const geometry = new THREE.BufferGeometry().setFromPoints( [ new THREE.Vector3( 0, 0, 0 ), new THREE.Vector3( 0, 0, - 1 ) ] );

				const line = new THREE.Line( geometry );
				line.name = 'line';
				line.scale.z = 5;

				controller1.add( line.clone() );
				controller2.add( line.clone() );
				

			} );
		
			renderer.xr.addEventListener("sessionstart", (e) => {
				
				const session = renderer.xr.getSession(),
				isIOS = ((/iPad/i).test(navigator.platform) || (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1));

				//console.log("Session started", session);

				//visionOS with inputSources
				const visionOSWithControls = isIOS && session.inputSources && session.inputSources.length,
				hasHandTracking = session.enabledFeatures && session.enabledFeatures.indexOf("hand-tracking") > 0;

			
				if (hasHandTracking || visionOSWithControls) {
					console.log("supports hand tracking");
					const controllerModelFactory = new XRControllerModelFactory();
					const handModelFactory = new XRHandModelFactory();

					// Hand 1
					controllerGrip1 = renderer.xr.getControllerGrip( 0 );
					controllerGrip1.add( controllerModelFactory.createControllerModel( controllerGrip1 ) );
					scene.add( controllerGrip1 );

					hand1 = renderer.xr.getHand( 0 );

			
					hand1.add( handModelFactory.createHandModel( hand1 ) );

					scene.add( hand1 );

					// Hand 2
					controllerGrip2 = renderer.xr.getControllerGrip( 1 );
					controllerGrip2.add( controllerModelFactory.createControllerModel( controllerGrip2 ) );
					scene.add( controllerGrip2 );

					hand2 = renderer.xr.getHand( 1 );
					hand2.add( handModelFactory.createHandModel( hand2 ) );
					scene.add( hand2 );

				} else {
					console.log("No hand tracking support");
				}
			
				//console.log("session start ", renderer.xr.getSession());
			});