Declare PDF/UA-2 and announce the document title

veraPDF reported two metadata failures against ISO 14289-2: nothing
identified the file as PDF/UA (clause 5), and ViewerPreferences was
missing DisplayDocTitle (clause 8.11.2), so viewers announced the
filename instead of the title.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

slides_template/example.tex

@@ -1,4 +1,5 @@
 \DocumentMetadata{
+  pdfstandard=ua-2,
   pdfversion=2.0,
   lang=en-US,
 }
@@ -161,6 +162,10 @@ BoldItalicFont  =   *-BoldItalic
 % \hypersetup{colorlinks=true, linkcolor=Black, citecolor=Black, filecolor=makopurple1,
 %     urlcolor=Plum, unicode=true}
 
+% assistive software should announce the document title rather than the
+% filename; PDF/UA requires this to be set explicitly
+\hypersetup{pdfdisplaydoctitle=true}
+
 % create a new \e{} command to make things purple and bold
 % (falls back to \textit{} on standout slides where alert color is invisible)
 \newcommand{\e}[1]{%