- packing_list renders A5 content into top region of an A4 portrait page
when paper=a4, so A5 paper loaded horizontally in an A4 tray prints upright
- run.generate/print_document/print_api thread the optional paper param through
- README: new Print Service section with A4 carrier usage + curl example
- Swagger: POST /api/print description documents the A4 carrier mode