make_certificate() renders a landscape PDF certificate
with decorative borders, corner ornaments, optional laurels, an optional
logo, and one or two signature blocks.cert_theme() constructs a color palette; convenience
presets cert_theme_classic(),
cert_theme_formal(), and cert_theme_warm()
cover common looks.device = c("cairo_pdf", "pdf") argument lets the caller
fall back to the base pdf device on systems without Cairo
(e.g. macOS without XQuartz, stripped Linux containers).
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