Adds structured delivery-note extraction alongside the existing invoice extractor and purchase-order matcher; does not duplicate invoice-extract or filing-to-json. Strict namespace-aware XML parsing, no model or foreign API. Only supplied source fields are returned; optional fields are null. Validates extraction bounds, dates, unique line IDs and decimal quantities, but does not claim full UBL XSD or legal conformity. No invoice, PDF or OCR support.

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