Added the system from trail

Runtime/EncountersCollection.cs

@@ -0,0 +1,13 @@
+using UnityEngine;
+
+namespace Jovian.EncounterSystem {
+    /// <summary>
+    /// Top-level asset that groups multiple <see cref="EncounterTable"/> references into a single
+    /// browsable unit. Pass one of these to <see cref="QuestProgress"/> to seed its gating graph.
+    /// </summary>
+    [CreateAssetMenu(fileName = "EncountersCollection", menuName = "Jovian/Encounter System/Encounters Collection", order = 0)]
+    public class EncountersCollection : ScriptableObject {
+        /// <summary>The tables grouped by this collection.</summary>
+        public EncounterTable[] encounterTables;
+    }
+}