The Domain Service drives the OpenZaakAanmaken external-worker task as a
hosted job worker (PRD §36): POST /registrations starts the registratie
process and returns; a polling worker acquires the job, opens a zaak via
the ACL (§8.1), attaches the zaak URL to the aggregate, and completes the
job. The Workflow Client is the only Flowable client (§8.2); the worker
logic is an Application service over ports. Registration state is in-memory
for the minimal slice (the read path is the projection, S-06).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
