js-on-sx: for..of / for..in + more Array methods

Parser: jp-parse-for-stmt does 2-token lookahead for (var? ident
(of|in) expr), emits (js-for-of-in kind ident iter body) else
classic (js-for init cond step body).

Transpile: wraps body in (call/cc (__break__) (let items
(for-each (fn (ident) (call/cc (__continue__) body)) items))).

Runtime: js-iterable-to-list normalizes list/string/dict for of
iteration; js-string-to-list expands string to char list.

399/401 unit (+8), 148/148 slice unchanged.

lib/js/test.sh

@@ -1027,6 +1027,14 @@ cat > "$TMPFILE" << 'EPOCHS'
 (epoch 2104)
 (eval "(js-eval \"[1,2,1,2].indexOf(2, 2)\")")
 
+;; ── Phase 11.forofin: for..of / for..in ─────────────────────────
+(epoch 2200)
+(eval "(js-eval \"var s=0; for (var x of [1,2,3]) s=s+x; s\")")
+(epoch 2201)
+(eval "(js-eval \"var r=''; for (var k in {a:1, b:2}) r=r+k; r.length\")")
+(epoch 2202)
+(eval "(js-eval \"var s=''; for (var c of 'abc') s=s+c; s\")")
+
 EPOCHS
 
 
@@ -1578,6 +1586,11 @@ check 2102 "fill(0)"                       '"0,0,0"'
 check 2103 "fill(0,1,3)"                   '"1,0,0,4"'
 check 2104 "indexOf with start"            '3'
 
+# ── Phase 11.forofin ───────────────────────────────────────────
+check 2200 "for-of array"                  '6'
+check 2201 "for-in object keys count"      '2'
+check 2202 "for-of string"                 '"abc"'
+
 TOTAL=$((PASS + FAIL))
 if [ $FAIL -eq 0 ]; then
   echo "✓ $PASS/$TOTAL JS-on-SX tests passed"