Add TownSquare scene assets, resource production docs, and model pipeline updates.

Bring in plaza props/prefabs, ZhaoYun source GLB, design originals, and Hunyuan/Blender tooling used to produce them.

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

AIClient/AgentScripts/FrameTownSquare.cs

@@ -0,0 +1,18 @@
+using UnityEditor;
+using UnityEngine;
+
+public static class FrameTownSquare
+{
+    public static string Run()
+    {
+        SceneView.FocusWindowIfItsOpen<SceneView>();
+        var v = SceneView.lastActiveSceneView;
+        if (v == null && SceneView.sceneViews.Count > 0)
+            v = SceneView.sceneViews[0] as SceneView;
+        if (v == null)
+            return "no scene view";
+        v.LookAt(new Vector3(0f, 1.0f, 0.5f), Quaternion.Euler(38f, 12f, 0f), 22f);
+        v.Repaint();
+        return "framed";
+    }
+}