UserDataBundle advertised an auditLog field that the export never
populated (audit finding A14). PayloadDataExport now queries the
audit-logs collection scoped to actorId === subjectId and reconstructs
AuditEntry values from the flat rows; when the audit core's collection
is not registered the field stays undefined.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>