The Ghostscript work directory had a predictable name under the shared
temporary directory, and a failed removal of an existing one was ignored.
Another local user could create it first with an in.pdf symlink, and
writing the input would follow it. The directory is now created with
tempfile (random name, owner-only permissions, fails if it exists), and
in.pdf is created with create_new.
craft-plate-test writes JSON scenes through craft-pdf and checks the written PDF's
structure (CI, under a second) and, locally only, its separated plates through
Ghostscript tiffsep (scripts/plate-check.sh). Apps can run the same scenes through
their own export as a dev-dependency.
Dylan M. Taylor