Parse a raw UN/EDIFACT document (the B2B EDI format used...

Parse a raw UN/EDIFACT document (the B2B EDI format used across Europe, Asia, logistics and customs — the international counterpart to ANSI X12) into clean, structured JSON. POST { edi } with the raw interchange text. Reads the optional UNA service-string advice to auto-detect delimiters (or applies the UN defaults: component ':', element '+', segment "'", release '?'), handles release-character escaping, then returns the interchange envelope (UNB: syntax id, sender/recipient with qualifiers, date/time, control reference, test indicator), and each message with its type decoded (e.g. ORDERS = Purchase Order, INVOIC = Invoice, DESADV = Despatch Advice/ASN, ORDRSP = PO Response, CONTRL = Acknowledgment) plus version/release/agency from the UNH, every segment named (BGM, DTM, NAD, LIN, QTY, MOA, …), and a semantic summary — for an order that's the order number, document/delivery dates, parties (buyer/seller/ship-to with role decoded), and line items (product id + quantity); for an invoice the invoice number, currency, parties and total; for a despatch advice the despatch number, date and package/line counts. Deterministic, no external calls. Turns opaque EDIFACT into something an agent can use without hand-rolling a parser.