🤖 fix: throw on sendMessageAndWait timeout instead of silently returning partial events

The helper was ignoring the return value of waitForEvent, so when a
timeout occurred tests would get partial events without stream-end,
causing confusing assertion failures like 'expected undefined to be defined'.

Now throws a clear error with diagnostics: 'Timeout waiting for stream-end after Xms'

Author: ammar-agent

tests/ipcMain/helpers.ts

@@ -232,7 +232,16 @@ export async function sendMessageAndWait(
 
   // Wait for stream completion
   const collector = createEventCollector(env.sentEvents, workspaceId);
-  await collector.waitForEvent("stream-end", timeoutMs);
+  const streamEnd = await collector.waitForEvent("stream-end", timeoutMs);
+
+  if (!streamEnd) {
+    collector.logEventDiagnostics(`sendMessageAndWait timeout after ${timeoutMs}ms`);
+    throw new Error(
+      `sendMessageAndWait: Timeout waiting for stream-end after ${timeoutMs}ms.\n` +
+        `See detailed event diagnostics above.`
+    );
+  }
+
   return collector.getEvents();
 }