PDF is not tagged

The PDF has no structure tags, so screen readers cannot tell headings, paragraphs, lists and figures apart.

Fix

‸Add \DocumentMetadata{lang=en, pdfstandard=ua-2, pdfversion=2.0, tagging=on} as the first line of main.tex and compile with LuaLaTeX. An untagged PDF also fails most veraPDF clauses; they are folded into this problem.