feat: add plugin marketplace renderer

tests/unit/main-layout-module-gate.test.tsx

@@ -112,6 +112,15 @@ describe('MainLayout module isolation', () => {
     expect(screen.queryByTestId('project-initialization-gate')).not.toBeInTheDocument();
   });
 
+  it.each(['/plugin-marketplace', '/my-plugins'])(
+    'keeps global plugin route %s outside the local project initialization gate',
+    (path) => {
+      renderLayout(path);
+      expect(screen.getByTestId('route-content')).toBeVisible();
+      expect(screen.queryByTestId('project-initialization-gate')).not.toBeInTheDocument();
+    },
+  );
+
   it('keeps the programming workspace padding compensation separate from painting', () => {
     renderLayout('/chat');