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/InspectMaleExplorerFinal.cs

@@ -0,0 +1,31 @@
+using System.Globalization;
+using System.Text;
+using UnityEditor;
+using UnityEngine;
+
+public static class InspectMaleExplorerFinal
+{
+    public static string Execute()
+    {
+        const string path = "Assets/Bundles/Characters/MaleExplorer/MaleExplorer.prefab";
+        var prefab = AssetDatabase.LoadAssetAtPath<GameObject>(path);
+        var go = (GameObject)PrefabUtility.InstantiatePrefab(prefab);
+        go.transform.position = new Vector3(0f, go.transform.position.y, 2.5f);
+        var sb = new StringBuilder();
+        sb.AppendLine(string.Format(CultureInfo.InvariantCulture,
+            "root pos={0} rot={1} scale={2}",
+            go.transform.position, go.transform.eulerAngles, go.transform.localScale));
+        foreach (var r in go.GetComponentsInChildren<Renderer>(true))
+        {
+            if (r.name == "ShadowDisc") continue;
+            var b = r.bounds;
+            sb.AppendLine(string.Format(CultureInfo.InvariantCulture,
+                "{0} bounds center=({1:F3},{2:F3},{3:F3}) size=({4:F3},{5:F3},{6:F3}) mat={7} shader={8}",
+                r.name, b.center.x, b.center.y, b.center.z, b.size.x, b.size.y, b.size.z,
+                r.sharedMaterial ? r.sharedMaterial.name : "null",
+                r.sharedMaterial && r.sharedMaterial.shader ? r.sharedMaterial.shader.name : "null"));
+        }
+        Object.DestroyImmediate(go);
+        return sb.ToString();
+    }
+}