After submitting, the zorgprofessional supplies their documents; the page posts to
the BFF keyed by the reference and confirms ("Uw documenten zijn aangeleverd"), with
a surfaced failure + retry. The registration e2e provides documents before the
behandelaar step, since the process now parks at WachtOpDocumenten first.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>