FlowableWorkflowClient implements IRegistratieVerlopenClient (acquire/complete the RegistratieVerlopen jobs) and CompleteDocumentWaitAsync (complete WachtOpDocumenten, best-effort). Wires the RegistratieVerlopenProcessor + hosted RegistratieVerlopenPump into the domain host and excludes the pump from mutation (like the other pumps). Fakes updated for the new IWorkflowClient member. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>