Delete the echo demo agent package (CL-7381)

apps/hub/package.json

@@ -64,7 +64,6 @@
     "@modelcontextprotocol/sdk": "catalog:",
     "@workbench/access-policy": "workspace:*",
     "@workbench/connections": "workspace:*",
-    "@workbench/echo": "workspace:*",
     "@workbench/hub-client": "workspace:*",
     "@workbench/onboarding": "workspace:*",
     "@workbench/templates": "workspace:*",

apps/hub/src/index.ts

@@ -280,7 +280,6 @@ import {
   createWorkflowArtifactRoutes,
   createWorkflowRunAuthenticator,
 } from "@corbits/artifacts-hub";
-import { createEchoRoutes } from "@workbench/echo";
 import {
   createArtifactDocPersistence,
   createPresenceRoomRegistry,
@@ -1167,10 +1166,6 @@ export async function createHub(config: HubConfig) {
   // nothing reported. See `hubErrorHandler`'s own doc comment.
   app.onError(hubErrorHandler());
 
-  // Extension routes mount under the tenant prefix, inside the
-  // platform's native tenant middleware, so every extension handler
-  // runs with c.get("tenant") / c.get("principal") resolved.
-  app.route(`${TENANT_PREFIX}/echo`, createEchoRoutes());
   // One in-process presence room registry for this process, constructed
   // here in the composition root — the same pattern `workbenchSubscribers`
   // above uses. Presence rooms are ephemeral and process-local by design

apps/hub/test/composition.test.ts

@@ -1,5 +1,5 @@
 // Exercises the hub's own wiring: platform routes answering at boot,
-// the echo extension mounted inside the native tenant middleware, and
+// an extension route mounted inside the native tenant middleware, and
 // same-origin static serving. Platform behavior behind the mounted
 // routes belongs to its own packages and is not re-proven here. Booting
 // the hub runs package migrations, so a reachable DATABASE_URL is
@@ -122,23 +122,22 @@ describeIfDb("shutdown", () => {
 });
 
 describeIfDb("extension mounting", () => {
-  test("echo mounts inside the native tenant middleware", async () => {
+  test("chat mounts inside the native tenant middleware", async () => {
     const hub = await bootHub();
 
-    // Anonymous request to the echo route: the platform's tenant
+    // Anonymous request to an extension route: the platform's tenant
     // middleware answers 401 before the extension's handler runs.
-    const gated = await hub.app.request("/api/tenants/some-tenant/echo", {
-      method: "POST",
-      body: "hello",
-    });
+    const gated = await hub.app.request(
+      "/api/tenants/some-tenant/chat/workbenches",
+    );
     expect(gated.status).toBe(401);
     expect(await gated.json()).toEqual({
       error: { code: "unauthorized", message: "Authentication required" },
     });
 
     // The route exists only under the tenant scope; outside it the
     // path falls through to the interface shell.
-    const outside = await hub.app.request("/echo");
+    const outside = await hub.app.request("/chat/workbenches");
     expect(await outside.text()).toBe("<html>shell</html>");
   });