txt section numbering, @typeface :middle/:lift and html scale, NewGardinerOmni, html :leading (from dev 9fa469dd74ed)

Section headings under txt are numbered inside a @document only; @typeface
gains :middle and :lift and its :scale now means the same in html and
pdf; NewGardinerOmni ships (OFL 1.1, Mark-Jan Nederhof) and @egyptian /
@chinese replace @cjk; @table :leading and :colsep reach html; kdesc
--typeface help names the flag; @document.txt is a Python class.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tst/kdesc_test.sh

@@ -8,7 +8,7 @@
 #   * a flag a user reaches for often gets a single letter (-k klammers,
 #     -t targets, -c character codes, -i input); a more specialised topic gets
 #     a multi-letter name (--argtypes, --katoms, --rewrite, --optionsets,
-#     --coverage, --klammersets, --font);
+#     --coverage, --klammersets, --typeface);
 #   * -v says how much to show about the command's PROCESSING and never what
 #     its RESULT contains.  So the katom regex column is "--katoms full" and
 #     the coverage file column is "--coverage all", not verbosity levels.
@@ -151,6 +151,11 @@ shows "24. --coverage help explains"       'Coverage commands'  "$KDESC" --cover
 shows "25. --katoms help explains"         'Katom commands'     "$KDESC" --katoms help
 shows "26. an unknown coverage word"       'Unrecognized coverage command' "$KDESC" --coverage nonsense
 shows "27. an unknown katom word"          'Unrecognized katom command'    "$KDESC" --katoms nonsense
+# The help text and the error must name the flag by its CURRENT spelling:
+# both still said --font for three weeks after the 2026-08-25 rename, and  # retired-ok
+# the retired-name guard's entries did not match the bare word.
+shows "27a. --typeface help names --typeface install" '--typeface install' "$KDESC" --typeface help
+shows "27b. an unknown typeface word names the flag" 'Unrecognized typeface command: --typeface' "$KDESC" --typeface nonsense
 
 echo
 echo "-- provenance: -i shows what the INPUT defines --"