A rest argument keeps an empty first element; a removal block keeps its neighbour; the Markdown converter reads paragraphs whole; Smart App Control on the Windows page (from dev 1083db946f05)

- A rest argument (a list's or a table's items) now strips exactly ONE
  leading bar -- the separator from what precedes it -- so a second one is
  an empty first element: a table with an empty header corner is written
  `@table |` then ` | Maskulinum | ...`. Before, every leading bar was
  dropped and such a header row shifted one column left. New shipped suite
  tst/rest_test.sh.
- Text written hard against a closing ]# (a period, a letter) is no longer
  removed with the block; a following space or line break still is.
- sks/tns/md_to_sks.py converts inline Markdown per paragraph, so emphasis
  that wraps is converted and not mis-paired; bold may contain italic;
  tables are unnumbered; links to sibling .md files converted alongside
  become links to their html pages; the arrow becomes @rightarrow@.
- doc/install/windows_source_install.md: Smart App Control must be off --
  it blocks MSYS2's unsigned toolchain, and its Evaluation state turns
  itself on later.

tst/rest_test.sh

@@ -0,0 +1,94 @@
+#!/bin/bash
+#
+# rest_test.sh — Regression tests for the bar structure of a rest argument.
+#
+# A rest argument collects everything after the declared positional
+# arguments, bars included, and hands the structure on; a klammer reads the
+# bar count as dimension (| elements, || rows).  The one thing the ENGINE
+# decides is where the structure begins and ends:
+#
+#   * exactly ONE written leading bar is stripped — the bar that separates
+#     the rest from what precedes it: the last positional argument, the
+#     options, or the klammer name in the opening-bar idiom (`@table |` with
+#     the rows on the lines below).  Every further leading bar delimits an
+#     EMPTY FIRST ELEMENT the writer meant: `@table | | M | F ||` has an
+#     empty corner cell.  Decided 2026-10-01; before it every leading bar
+#     was trimmed, so an empty first element could not be written at all,
+#     and a Markdown table's empty header corner shifted the header row one
+#     column left.
+#   * trailing bars and whitespace are trimmed (the customary dangling
+#     separator before a closing @), as before.
+#   * an empty element between two bars is kept wherever it stands.
+#
+# The rest(N) cast (kutil.rest_split) is SKS Python and is tested at that
+# tier; here the value is read back raw through *name* substitution.
+#
+# Engine tier: --klammersets none, fixtures inline.
+#
+# Usage: ./rest_test.sh   (LSan suppressions come from env/runtime.env)
+# Exit code: 0 if all tests pass, 1 otherwise.
+
+PASS=0
+FAIL=0
+KTEXT=ktext
+K=${KLAMMERTEXT_HOME:?KLAMMERTEXT_HOME must be set}
+
+red=$'\033[31m'
+green=$'\033[32m'
+reset=$'\033[0m'
+
+trim() { awk '{ sub(/[ \t\r]+$/, "") } { line[NR]=$0 } END { f=1; while (f<=NR && line[f]=="") f++; l=NR; while (l>=1 && line[l]=="") l--; for (i=f;i<=l;i++) print line[i] }'; }
+
+# check_eq TEST_NAME EXPECTED INPUT
+#   The fixtures: @zz takes only a rest, @yy one positional then a rest.
+#   Each prints its arguments in brackets, so the bar structure is visible.
+check_eq() {
+    local test_name="$1" expected="$2" input="$3"
+    local output status
+    output=$("$KTEXT" --klammersets none -d -s "@@zz items.rest :x 0 : [*items*] @@ @@yy first | second.rest : [*first*][*second*] @@ $input" 2>/tmp/rest_test_err.$$)
+    status=$?
+    output=$(printf '%s' "$output" | trim)
+    if [ $status -ne 0 ]; then
+        echo "${red}FAIL${reset} $test_name — ktext exited $status"
+        echo "       stderr: $(head -3 /tmp/rest_test_err.$$)"
+        FAIL=$((FAIL + 1))
+        return
+    fi
+    if [ "$output" = "$expected" ]; then
+        echo "${green}PASS${reset} $test_name"
+        PASS=$((PASS + 1))
+    else
+        echo "${red}FAIL${reset} $test_name"
+        echo "       expected: [$expected]"
+        echo "       got:      [$output]"
+        FAIL=$((FAIL + 1))
+    fi
+}
+
+echo "-- the leading bar --"
+check_eq " 1. no leading bar: the elements as written"          '[M | F]'     '@zz M | F @'
+check_eq " 2. the opening-bar idiom: one bar stripped"           '[M | F]'     '@zz | M | F @'
+check_eq " 3. a second leading bar is an empty first element"   '[| M | F]'   '@zz | | M | F @'
+check_eq " 4. the idiom with the rows below, empty corner cell" '[| M | F ||
+Nom | der]' '@zz |
+ | M | F ||
+Nom | der @'
+check_eq " 5. options first, then the idiom bar"                '[M | F]'     '@zz :x 1 | M | F @'
+check_eq " 6. options first, then an empty first element"       '[| M | F]'   '@zz :x 1 | | M | F @'
+
+echo
+echo "-- after a positional argument --"
+check_eq " 7. the bar after the positional is the separator"    '[a][b | c]'  '@yy a | b | c @'
+check_eq " 8. a second bar there is an empty first element"     '[a][| b | c]' '@yy a | | b | c @'
+
+echo
+echo "-- the middle and the end --"
+check_eq " 9. an empty element between bars is kept"            '[M | | F]'   '@zz M | | F @'
+check_eq "10. one trailing bar is trimmed"                      '[M | F]'     '@zz M | F | @'
+check_eq "11. a row separator is never the stripped bar"        '[|| M | F]'  '@zz || M | F @'
+
+echo
+echo "================================"
+echo "Passed: $PASS  Failed: $FAIL"
+rm -f /tmp/rest_test_err.$$
+[ $FAIL -eq 0 ]