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>

Tools/model_tools/bl_convert.py

@@ -397,8 +397,17 @@ def main():
                for m in used_mats]
 
     _strip_textures()
+    from bl_decimate import export_fbx_source_yup, prepare_game_export
+    meshes = [o for o in bpy.data.objects if o.type == "MESH"]
+    for obj in meshes:
+        prepare_game_export(obj)
+    bpy.ops.object.select_all(action="DESELECT")
+    for obj in meshes:
+        obj.select_set(True)
+    if meshes:
+        bpy.context.view_layer.objects.active = meshes[0]
     fbx_out = os.path.join(outdir, model_name + ".fbx")
-    bpy.ops.export_scene.fbx(filepath=fbx_out, path_mode='STRIP', embed_textures=False)
+    export_fbx_source_yup(fbx_out)
 
     print("MT_SUMMARY " + json.dumps(
         {"model": model_name, "fbx": os.path.basename(fbx_out), "materials": results},