System requirements: Quarto command line tool
(<https://github.com/quarto-dev/quarto-cli>), needed only to
build the package vignettes. Optional for PDF output: a TeX
distribution (e.g. TinyTeX) or Typst
(<https://github.com/typst/typst>, standalone or the copy
bundled with Quarto); see check_latex() and check_typst().