feat(tui): add agent picker and agents list rpc

src/gateway/server.agents.test.ts

@@ -0,0 +1,49 @@
+import { describe, expect, test } from "vitest";
+import {
+  connectOk,
+  installGatewayTestHooks,
+  rpcReq,
+  startServerWithClient,
+  testState,
+} from "./test-helpers.js";
+
+installGatewayTestHooks();
+
+describe("gateway server agents", () => {
+  test("lists configured agents via agents.list RPC", async () => {
+    testState.routingConfig = {
+      defaultAgentId: "work",
+      agents: {
+        work: { name: "Work" },
+        home: { name: "Home" },
+      },
+    };
+
+    const { ws } = await startServerWithClient();
+    const hello = await connectOk(ws);
+    expect(
+      (hello as unknown as { features?: { methods?: string[] } }).features
+        ?.methods,
+    ).toEqual(expect.arrayContaining(["agents.list"]));
+
+    const res = await rpcReq<{
+      defaultId: string;
+      mainKey: string;
+      scope: string;
+      agents: Array<{ id: string; name?: string }>;
+    }>(ws, "agents.list", {});
+
+    expect(res.ok).toBe(true);
+    expect(res.payload?.defaultId).toBe("work");
+    expect(res.payload?.mainKey).toBe("main");
+    expect(res.payload?.scope).toBe("per-sender");
+    expect(res.payload?.agents.map((agent) => agent.id)).toEqual([
+      "work",
+      "home",
+    ]);
+    const work = res.payload?.agents.find((agent) => agent.id === "work");
+    const home = res.payload?.agents.find((agent) => agent.id === "home");
+    expect(work?.name).toBe("Work");
+    expect(home?.name).toBe("Home");
+  });
+});