Enables \DocumentMetadata (pdfversion=2.0, pdfstandard=ua-2) and
tagpdf with activate-all. Adds an H1 structure tag around every
frame title via \addtobeamertemplate, wraps the overlay-only tikz
helpers (\marktopleft, \markbottomright, \credit) in artifact tags
so they don't pollute the reading order, and adds alt text to each
\includegraphics. Verified compliant with verapdf's PDF/UA-2 profile.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Benjamin Mako Hill
c4a709c22c