Add --print to regenerate PDFs from invoices.json without ledger writes.
Support optional dueDate on ledger rows (default remains invoice date + 14 days)
and persist dueDate when saving new production rows.
Data: limmud_fsu_canada client with invoiceFileName, cruise_event_av_it
product, 2026-LFSU01 sample invoice, Levkin contact fields in sender.json.
README and project.md describe CLI, schema, and May 2026 changelog.
Co-authored-by: Cursor <cursoragent@cursor.com>
