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Add the Ingetrokken terminal status, Registration.Withdraw() (open-only, idempotent), the WithdrawRegistration handler, and the domain endpoint. Cancelling the running Flowable process (so the case leaves the werkbak) and the owner-scoped BFF/self-service action are follow-up sub-slices (S-11b/S-11c). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>