feat(qa-lab): add control ui qa-channel roundtrip scenario

ui/src/ui/app-gateway.sessions.node.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it, vi } from "vitest";
 
 const loadSessionsMock = vi.fn();
+const loadChatHistoryMock = vi.fn();
 
 vi.mock("./app-chat.ts", () => ({
   CHAT_SESSIONS_ACTIVE_MINUTES: 10,
@@ -24,7 +25,7 @@ vi.mock("./controllers/assistant-identity.ts", () => ({
   loadAssistantIdentity: vi.fn(),
 }));
 vi.mock("./controllers/chat.ts", () => ({
-  loadChatHistory: vi.fn(),
+  loadChatHistory: loadChatHistoryMock,
   handleChatEvent: vi.fn(() => "idle"),
 }));
 vi.mock("./controllers/devices.ts", () => ({
@@ -124,6 +125,39 @@ describe("handleGatewayEvent sessions.changed", () => {
   });
 });
 
+describe("handleGatewayEvent session.message", () => {
+  it("reloads chat history for the active session", () => {
+    loadChatHistoryMock.mockReset();
+    const host = createHost();
+    host.sessionKey = "agent:qa:main";
+
+    handleGatewayEvent(host, {
+      type: "event",
+      event: "session.message",
+      payload: { sessionKey: "agent:qa:main" },
+      seq: 1,
+    });
+
+    expect(loadChatHistoryMock).toHaveBeenCalledTimes(1);
+    expect(loadChatHistoryMock).toHaveBeenCalledWith(host);
+  });
+
+  it("ignores transcript updates for other sessions", () => {
+    loadChatHistoryMock.mockReset();
+    const host = createHost();
+    host.sessionKey = "agent:qa:main";
+
+    handleGatewayEvent(host, {
+      type: "event",
+      event: "session.message",
+      payload: { sessionKey: "agent:qa:other" },
+      seq: 1,
+    });
+
+    expect(loadChatHistoryMock).not.toHaveBeenCalled();
+  });
+});
+
 describe("addExecApproval", () => {
   it("keeps the newest approval at the front of the queue", () => {
     const queue = addExecApproval(

ui/src/ui/app-gateway.ts

@@ -393,6 +393,17 @@ function handleChatGatewayEvent(host: GatewayHost, payload: ChatEventPayload | u
   }
 }
 
+function handleSessionMessageGatewayEvent(
+  host: GatewayHost,
+  payload: { sessionKey?: string } | undefined,
+) {
+  const sessionKey = payload?.sessionKey?.trim();
+  if (!sessionKey || sessionKey !== host.sessionKey) {
+    return;
+  }
+  void loadChatHistory(host as unknown as ChatState);
+}
+
 function handleGatewayEventUnsafe(host: GatewayHost, evt: GatewayEventFrame) {
   host.eventLogBuffer = [
     { ts: Date.now(), event: evt.event, payload: evt.payload },
@@ -429,6 +440,11 @@ function handleGatewayEventUnsafe(host: GatewayHost, evt: GatewayEventFrame) {
     return;
   }
 
+  if (evt.event === "session.message") {
+    handleSessionMessageGatewayEvent(host, evt.payload as { sessionKey?: string } | undefined);
+    return;
+  }
+
   if (evt.event === "presence") {
     const payload = evt.payload as { presence?: PresenceEntry[] } | undefined;
     if (payload?.presence && Array.isArray(payload.presence)) {