Added the system from trail

Runtime/Reward.cs

@@ -0,0 +1,22 @@
+using UnityEngine;
+
+namespace Jovian.EncounterSystem {
+    /// <summary>
+    /// Authored reward asset. Designers create one file per reusable reward ("10 Gold", "Rusty Sword",
+    /// "Town Unlock: Riverfort") and reference it from <see cref="GiveRewardEvent"/> on dialog options.
+    /// The <see cref="kind"/> payload chooses the reward type; the enclosing asset carries identity
+    /// and presentation data shared across all types.
+    /// </summary>
+    [CreateAssetMenu(fileName = "Reward", menuName = "Jovian/Encounter System/Reward", order = 3)]
+    public class Reward : ScriptableObject {
+        /// <summary>Designer-facing short slug (e.g. "gold_10").</summary>
+        public string id;
+
+        /// <summary>Display name shown to the player when the reward is granted.</summary>
+        public string displayName;
+
+        /// <summary>Type-specific payload (currency, item, experience, ...). Authored via the SubclassSelector drawer.</summary>
+        [SerializeReference, SubclassSelector]
+        public IRewardKind kind;
+    }
+}