js-on-sx: callable Number/String/Boolean/Array + Array.sort

Builtin constructors now have :__callable__ slot. js-call-plain
and js-function? detect dicts with __callable__ and dispatch
through it. Number('42')===42, String(true)==='true', Boolean(0)
===false, Array(3) builds length-3 list.

Array.prototype.sort(comparator?): bubble sort via js-list-sort-
outer!/-inner!. Default lex order, custom comparator supported.

Wide scoreboard committed: 259/5354 (4.8%) from earlier runtime.

438/440 unit (+11), 148/148 slice unchanged.

lib/js/test.sh

@@ -1103,6 +1103,32 @@ cat > "$TMPFILE" << 'EPOCHS'
 (epoch 2803)
 (eval "(js-eval \"var q=42; q??=99; q\")")
 
+;; ── Phase 11.callable: Number()/String()/Boolean()/Array() ─────
+(epoch 2900)
+(eval "(js-eval \"Number('42')\")")
+(epoch 2901)
+(eval "(js-eval \"String(123)\")")
+(epoch 2902)
+(eval "(js-eval \"String(true)\")")
+(epoch 2903)
+(eval "(js-eval \"Boolean(0)\")")
+(epoch 2904)
+(eval "(js-eval \"Boolean('hi')\")")
+(epoch 2905)
+(eval "(js-eval \"Array(3).length\")")
+(epoch 2906)
+(eval "(js-eval \"Array(1,2,3).length\")")
+
+;; ── Phase 11.sort: Array.prototype.sort ──────────────────────
+(epoch 3000)
+(eval "(js-eval \"[3,1,2].sort().join(',')\")")
+(epoch 3001)
+(eval "(js-eval \"[10,5,20].sort().join(',')\")")
+(epoch 3002)
+(eval "(js-eval \"[3,1,2].sort((a,b)=>a-b).join(',')\")")
+(epoch 3003)
+(eval "(js-eval \"[3,1,2].sort((a,b)=>b-a).join(',')\")")
+
 EPOCHS
 
 
@@ -1699,6 +1725,21 @@ check 2801 "&&= truthy"                     '7'
 check 2802 "??= null"                       '99'
 check 2803 "??= has value"                  '42'
 
+# ── Phase 11.callable ─────────────────────────────────────────
+check 2900 "Number('42')"                   '42'
+check 2901 "String(123)"                    '"123"'
+check 2902 "String(true)"                   '"true"'
+check 2903 "Boolean(0)"                     'false'
+check 2904 "Boolean('hi')"                  'true'
+check 2905 "Array(3).length"                '3'
+check 2906 "Array(1,2,3).length"            '3'
+
+# ── Phase 11.sort ────────────────────────────────────────────
+check 3000 "sort default"                   '"1,2,3"'
+check 3001 "sort lex (10<5)"                '"10,20,5"'
+check 3002 "sort numeric"                   '"1,2,3"'
+check 3003 "sort reverse"                   '"3,2,1"'
+
 TOTAL=$((PASS + FAIL))
 if [ $FAIL -eq 0 ]; then
   echo "✓ $PASS/$TOTAL JS-on-SX tests passed"