eims-receipt-document.mapper.ts maps an EimsReceipt onto the shared
InvoiceDocumentModel layout, reading amounts back out of the stored request
body. Refuses to render anything not REGISTERED. GET
invoices/:id/eims/receipts/:receiptId/document, scoped to the invoice.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
