First commit

Packages/com.jovian.encounter-system/Runtime/SubclassSelectorAttribute.cs

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+using System;
+using UnityEngine;
+
+namespace Jovian.EncounterSystem {
+    /// <summary>Renders a concrete-type picker dropdown for a <c>[SerializeReference]</c> field.</summary>
+    [AttributeUsage(AttributeTargets.Field, AllowMultiple = false)]
+    public class SubclassSelectorAttribute : PropertyAttribute {
+    }
+}