Fix MaleExplorer setup with shadow material and editor diagnostics.

Improve FBX/prefab import setup, CharacterSpawner, and add M3 inspect/rebuild helpers.

Co-authored-by: Cursor <cursoragent@cursor.com>

AIClient/Assets/Editor/M3/RebuildMaleExplorerNow.cs

@@ -0,0 +1,15 @@
+using UnityEditor;
+using UnityEngine;
+
+public static class RebuildMaleExplorerNow
+{
+    public static string Execute()
+    {
+        foreach (var go in Object.FindObjectsOfType<GameObject>())
+        {
+            if (go != null && go.name.Contains("MaleExplorer"))
+                Object.DestroyImmediate(go);
+        }
+        return SetupM3Character.SetupAll();
+    }
+}