Add SoundEffect audio system (ScriptableObject-based) with test assets

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/Scripts/Audio/SoundEffectInstance.cs

@@ -0,0 +1,65 @@
+using System.Collections;
+
+using UnityEngine;
+
+namespace Prototype
+{
+    [AddComponentMenu("/")]
+    public class SoundEffectInstance : MonoBehaviour
+    {
+        public AudioClip clip { get; set; }
+        public SoundEffectOptions options { get; set; }
+
+        AudioSource audioSource;
+
+        void Awake()
+        {
+            audioSource = gameObject.AddComponent<AudioSource>();
+            {
+                audioSource.playOnAwake = false;
+                audioSource.dopplerLevel = 0;
+                audioSource.outputAudioMixerGroup = options.audioMixerGroup;
+                audioSource.clip = clip;
+                audioSource.volume = options.GetVolume();
+                audioSource.pitch = options.GetPitch();
+
+                var range = options.GetDistanceRange();
+
+                audioSource.spatialBlend = range.x == 0 && range.y == 0 ? 0 : 1;
+                audioSource.rolloffMode = AudioRolloffMode.Linear;
+                audioSource.minDistance = range.x;
+                audioSource.maxDistance = range.y;
+                audioSource.loop = options.GetLoop();
+            }
+
+            if (!options.ShouldDestroyOnLoad())
+            {
+                DontDestroyOnLoad(this);
+            }
+        }
+
+        IEnumerator Start()
+        {
+            var delay = options.GetDelay();
+            if (delay > 0)
+            {
+                yield return new WaitForSeconds(delay);
+            }
+
+            audioSource.Play();
+
+            if (audioSource.loop)
+            {
+                yield break;
+            }
+
+            yield return new WaitForSecondsRealtime(audioSource.clip.length + .1f);
+            Destroy(gameObject);
+        }
+
+		public void Stop()
+		{
+			Destroy(gameObject);
+		}
+	}
+}