Resolved with [e493f1c6]:

  *  <code>spell-of-summoning!</code> is now called from <code>pollen.rkt</code> if HTML is the target output format.
  *  Listings functions return results inside a <code>'style</code> txexpr to keep <code>->html</code> from escaping the pre-cooked HTML strings.
  *  New function <code>unfence</code> provided from from <code>crystalize.rkt</code> to strip <code><style></code> tags from HTML.
  *  The SQLite cache now has a <code>series_pagenode</code> column for notes as well, just so notes can be filtered by series alongside articles in
  *  New function <code>here-output-path</code> provided from <code>dust.rkt</code>, occasioned by need to allow listing functions to default to filtering based on the current pagenode.
  *  Added <code>'style</code> to the list of “block tags” in the <code>setup</code> module; this prevents it from being surrounded by paragraph tags.
  *  Code docs updated to reflect the above wherever applicable.