Align task schedule optional fields with shared schema

cmd/sip-go-agent/dispatcher_integration_test.go

@@ -210,6 +210,9 @@ func TestDispatcherCommandStartsWithIsolatedMQHTTPAndAgent(t *testing.T) {
 	taskSchedule := taskConfig["schedule"].(map[string]any)
 	taskSchedule["starts_at"] = "2000-01-01T00:00:00+08:00"
 	taskSchedule["weekly_windows"] = weekly
+	// Exercise the current contract through HTTP, persistence, MQ and mTLS.
+	delete(taskSchedule, "ends_at")
+	delete(taskSchedule, "excluded_dates")
 	if examples["config-read-task-asr.json"], err = json.Marshal(taskConfig); err != nil {
 		t.Fatal(err)
 	}