Configure the middleware (?)

Author: ditman

samples/client/lit/shell_v0_9/middleware/a2a.ts

@@ -29,7 +29,7 @@ const A2UI_MIME_TYPE = "application/json+a2ui";
 
 const fetchWithCustomHeader: typeof fetch = async (url, init) => {
   const headers = new Headers(init?.headers);
-  headers.set("X-A2A-Extensions", "https://a2ui.org/a2a-extension/a2ui/v0.8");
+  headers.set("X-A2A-Extensions", "https://a2ui.org/a2a-extension/a2ui/v0.9");
 
   const newInit = { ...init, headers };
   return fetch(url, newInit);

samples/client/lit/shell_v0_9/vite.config.ts

@@ -30,6 +30,7 @@ export default async () => {
   };
 
   return {
+    // Do we need this for this sample?
     plugins: [Middleware.A2AMiddleware.plugin()],
     build: {
       rollupOptions: {