DocumentReference.subject must be a literal reference (min=1 on
.reference per the DocumentReferenceOrigenAR profile), not an
identifier token: the Bus rejects subject.identifier. Go back to
using the Patient entry's fullUrl as the reference in both ITI-65 and
ITI-67 (ITI-65 was never committed with the identifier-based version,
so only ITI-67 needed the revert here), dropping the now-unused
extractNationalIdentifier helper.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>