The filter consumes every Pandoc Note, so the "standard Pandoc-
generated section.footnotes" its doc claimed as the no-JS fallback
never existed — below 1500px with JS disabled, footnote content was
simply invisible (AUDIT §2.3). The filter now collects consumed notes
and appends the section itself: letter labels, jump targets for the
in-text refs (which now point at the visible fallback item), and
doc-backlink returns. sidenotes.js pairs ref/note by element id and
preventDefaults clicks, so behavior with JS is unchanged.
Verified in output: per-page item count matches inline sidenote count;
refs target #fn-<label>; backlinks target #snref-<label>.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Levi Neuwirth