PDF/X and CMYK groups keep this branch's approach: krilla's serialize
settings (pdfx::print_settings) write the CMYK page and transparency
groups, the GTS_PDFX output intent and the PDF/X Info and XMP entries.
make_pdfx4 adds only the XMP dates, so main's title argument and its
output-intent, Info and pdfxid XMP edits are dropped, and both
cmyk_group_spaces calls after writer.finish() (Export PDF, Print
Booklet) stay removed. Main's new parts are kept: file_info_metadata
(also for Print Booklet, on top of the print settings), optional content
registration and layer errors, add_form_fields, and pdfx's fonts module.
Main's metadata panic test calls the two-argument make_pdfx4.
craft-libs and the krilla patch are pinned to storytold/craft-libs
e3b9e239; Cargo.lock is main's, relocked without updates.
aiongg