PDF rendering failed on Linux with "stat usr/share/fonts/...: no such file or
directory": fpdf joins the font path onto its own font directory, which it
defaults to ".", so path.Join turns an absolute path into a
working-directory-relative one. It only resolved when the process happened to
run from the filesystem root, which is why Windows was unaffected. Font data is
now read by pdfout and handed over as bytes.
LoadFont also falls back to a bundled DejaVu Sans, so a host with no fonts
installed still renders. An explicitly requested font remains a hard error when
unreadable rather than being silently substituted. Tests verify the bundled font
parses and covers Vietnamese, which is the reason it exists.
Move monkeyd and pdfout out of internal/ so other modules can import them,
and add export.Export, which holds the crawl-to-PDF sequence the CLI used to
inline. The CLI now parses flags and delegates, so an embedding program gets
the same defaults and validation.
tiennm99