The guide now ships as `doc/Rectify_user_guide.pdf` alongside the Markdown
it is rendered from. The PDF is the one to read; the Markdown remains the
source and is authoritative if the two ever disagree.
It is committed rather than built here because rendering it needs a font
store and a headless browser, which no one should have to install in order
to read a guide. The same PDF is downloadable on its own from
https://andykopra.com/Rectify_user_guide.pdf — the macOS disk image holds
the application only.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>