test(redis): assert the fresh subscribe by channel, not by call count

A reconnect also re-subscribes surviving channels, so the new subscription is
identified by its channel rather than by SUBSCRIBE having been issued once.

Author: waleedlatif1

apps/sim/lib/execution/execution-signal.test.ts

@@ -463,7 +463,12 @@ describe('ExecutionSignalHub', () => {
       connection.status = 'ready'
       connection.client?.emit('ready')
       await again
-      expect(mockSubscribe).toHaveBeenCalledOnce()
+      // The reconnect also re-subscribes the surviving channel; what matters is
+      // that the new one went out only once readiness was genuinely observed.
+      expect(mockSubscribe).toHaveBeenCalledWith(
+        'execution:signal:execution-again',
+        'execution:cancel'
+      )
       expect(connection.client?.listenerCount('ready')).toBe(1)
       expect(vi.getTimerCount()).toBe(0)
     } finally {