test(FN-4706): complete Step 4 — stabilize verification gates

Fusion-Task-Id: FN-4706
Fusion-Task-Lineage: 00e9207c-d2dc-4bc4-ae92-4604339bcbc2

packages/dashboard/app/components/__tests__/QuickChatFAB.test.tsx

@@ -56,8 +56,8 @@ const modelSession: ChatSession = {
   title: "Model thread",
   status: "active",
   projectId: null,
-  createdAt: new Date().toISOString(),
-  updatedAt: new Date().toISOString(),
+  createdAt: "2026-05-16T00:00:02.000Z",
+  updatedAt: "2026-05-16T00:00:02.000Z",
 };
 
 const modelSessionAnthropic: ChatSession = {
@@ -76,8 +76,8 @@ const agentSession: ChatSession = {
   title: null,
   status: "active",
   projectId: null,
-  createdAt: new Date().toISOString(),
-  updatedAt: new Date().toISOString(),
+  createdAt: "2026-05-16T00:00:01.000Z",
+  updatedAt: "2026-05-16T00:00:01.000Z",
 };
 
 const agentTwoSession: ChatSession = {

packages/engine/src/worktrunk-installer.ts

@@ -117,6 +117,7 @@ export async function resolveWorktrunkBinary(opts: {
 
   logger.log("resolve: install path disabled; failing");
   await installWorktrunk(opts);
+  throw new WorktrunkInstallFailedError(AUTO_INSTALL_DISABLED_MESSAGE, { stage: "auto-install-disabled" });
 }
 
 export async function installWorktrunk(opts: {