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85a58c65c2
Two issues caused the deployed slide PDFs to be unusable:
1. Every chapter .tex declared `\setsansfont{Helvetica Neue}` — proprietary
to Apple, not installed on the Ubuntu CI runner. xelatex bombed mid-frame,
the workflow's `|| true` swallowed the error, and the resulting PDF had
most text never typeset (blank pages with only logos/rules surviving).
Switch all 35 decks to TeX Gyre Heros (sans) and TeX Gyre Cursor (mono),
both bundled with texlive-fonts-extra — no external font downloads needed.
Drop the JetBrains Mono wget step and fonts-liberation from both slide
workflows accordingly.
2. Vol1 and Vol2 each ship `00_course_overview.pdf` and `01_introduction.pdf`.
The publish workflow uploaded them to a flat GitHub Release namespace, so
the second upload silently overwrote the first — clicking Vol I's Course
Overview actually downloaded Vol II's deck. Stage prefixed copies
(vol1_*.pdf, vol2_*.pdf) before upload, and update slides/vol{1,2}.qmd
plus the mlsysim cross-links to point at the new prefixed URLs.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>