The Makefile has built with lualatex since the tagged PDF work in
2841ae9, but the README still told people to install texlive-xetex.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Add README with dependencies, clone instructions, script usage, and
patch submission guidance. Remove stale rubber invocation from the
clean target in the Makefile.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
