Fix Input System compatibility and missing AudioSource

Switch from legacy Input to new Input System package API.
Add RequireComponent to ensure AudioSource is present.

RunJets.cs

@@ -2,7 +2,9 @@ using System;
 using System.Collections.Generic;
 using Unity.InferenceEngine;
 using UnityEngine;
+using UnityEngine.InputSystem;
 
+[RequireComponent(typeof(AudioSource))]
 public class RunJets : MonoBehaviour
 {
     public ModelAsset modelAsset;
@@ -193,7 +195,7 @@ public class RunJets : MonoBehaviour
 
     void Update()
     {
-        if (Input.GetKeyDown(KeyCode.Space))
+        if (Keyboard.current.spaceKey.wasPressedThisFrame)
         {
             TextToSpeech();
         }