Show the in-frame title page and divider idiom in the example

Wrap \maketitle and \sectionpage in document-opened frames, following
beamer, so the notes and the vc revision stamp sit alongside them. The
Makefile built vc on every run but nothing used it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

slides_template/text.tex

@@ -45,10 +45,21 @@
 
 \begin{document}
 
-\maketitle
+% As in beamer, \maketitle and the divider commands can sit inside a frame you
+% open yourself, so notes and extras go alongside them. The revision stamp
+% comes from vc, which make writes before TeX runs.
+\begin{frame}
+  \maketitle
+  \input{vc}
+  \footline{Revision:\ \VCRevision\ (\VCDateTEX)}
+  \note{Introduce yourself before the title slide leaves the screen.}
+\end{frame}
 
 \section{Introduction}
-\sectionpage
+\begin{frame}
+  \sectionpage
+  \note{One sentence on why the introduction matters.}
+\end{frame}
 
 \begin{frame}
   \frametitle{A sample slide}