The provide-documents use case completes the WachtOpDocumenten task via the
Workflow Client (owner-scoped by bsn, best-effort), exposed as an owner-scoped
domain endpoint. This is the trigger that unblocks the process; the real file
upload + ZGW storage lands in S-10b.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>