removed extra extraneous comments

Cuts the multi-line rationale blocks down to what a reader of the file
needs. The reasoning behind the tagging setup belongs in the commit
messages that introduced it, not repeated above every \DocumentMetadata
block.

Also trims the README: drops the consequence clause explaining what
happens when the standard is declared without the tagging, drops the
quoted TeX Live 2024 error message, and notes that sid has a new enough
TeX Live for anyone not on Overleaf. Adds the caveat that a veraPDF
PASS is necessary but not sufficient, since a document whose body text
is all artifact passes too.

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

memo_template/text.tex

@@ -1,14 +1,4 @@
-% Tagged PDF (PDF/UA-2) accessibility setup. The article class works
-% with the LaTeX tagging project, so we use the full \DocumentMetadata
-% path here.
-%
-% tagging=on is what actually builds the structure tree: it loads the
-% kernel code that tags paragraphs, headings, lists, tables, and
-% floats. Declaring pdfstandard=ua-2 on its own only writes the claim
-% into the metadata; without tagging=on the PDF is marked as UA-2 but
-% carries no structure for a screen reader to read. This needs TeX
-% Live 2025 or later --- on Overleaf, set it in Menu > Settings >
-% TeX Live version.
+% Tagged PDF (PDF/UA-2) accessibility setup.
 \DocumentMetadata{
   tagging=on,
   pdfversion=2.0,