CODEX revised with following function: 1. GDS building, 2. different user group with different authority.

tests/layout-backend-static.test.js

@@ -18,10 +18,18 @@ assert(
   fs.existsSync(path.join(backendDir, 'gds_builder.py')),
   'backend/gds_builder.py should build hierarchical GDS from saved project YAML'
 );
+assert(
+  fs.existsSync(path.join(backendDir, 'routed_layout_preview.py')),
+  'backend/routed_layout_preview.py should create routed SVG previews through mxpic_router'
+);
 assert(
   serverPy.includes('create_layout_svg_from_gds'),
   'save-layout route should create a GDS-derived layout SVG preview'
 );
+assert(
+  serverPy.includes('create_routed_layout_svg'),
+  'save-layout route should use routed preview generation when links exist'
+);
 assert(
   serverPy.includes('svg_url'),
   'save-layout response should include an svg_url for the new layout tab'
@@ -64,3 +72,9 @@ assert(
   layoutPreviewPy.includes('_BB.gds') || layoutPreviewPy.includes('gds_path'),
   'layout_preview.py should resolve public GDS assets for placed components'
 );
+
+const gdsBuilderPy = fs.readFileSync(path.join(backendDir, 'gds_builder.py'), 'utf8');
+assert(
+  gdsBuilderPy.includes('_cells_have_links') && gdsBuilderPy.includes('Routed Build GDS requires mxpic_router'),
+  'Build GDS should not silently fall back to unrouted gdstk when links are present'
+);