ocaml: phase 4 bitwise ops land/lor/lxor/lsl/lsr/asr + bits.ml baseline (+5 tests, 607 total)

The binop precedence table already had land/lor/lxor/lsl/lsr/asr
(iter 0 setup) but eval-op fell through to 'unknown operator' for
all of them. SX doesn't expose host bitwise primitives, so each is
implemented in eval.sx via arithmetic on the host:

  land/lor/lxor:  mask & shift loop, accumulating 1<<k digits
  lsl k:          repeated * 2 k times
  lsr k:          repeated floor (/ 2) k times
  asr:            aliased to lsr (no sign extension at our bit width)

bits.ml baseline: popcount via 'while m > 0 do if m land 1 = 1 then
... ; m := m lsr 1 done'. Sum of popcount(1023, 5, 1024, 0xff) = 10
+ 2 + 1 + 8 = 21.

  5 land 3 = 1
  5 lor 3 = 7
  5 lxor 3 = 6
  1 lsl 8 = 256
  256 lsr 4 = 16

41 baseline programs total.

lib/ocaml/test.sh

@@ -1504,6 +1504,18 @@ cat > "$TMPFILE" << 'EPOCHS'
 (epoch 5253)
 (eval "(ocaml-run \"let t = Hashtbl.create 4 in Hashtbl.add t \\\"a\\\" 1; let t2 = Hashtbl.copy t in Hashtbl.add t2 \\\"b\\\" 2; Hashtbl.length t + Hashtbl.length t2\")")
 
+;; ── Bitwise ops land/lor/lxor/lsl/lsr ────────────────────────
+(epoch 5260)
+(eval "(ocaml-run \"5 land 3\")")
+(epoch 5261)
+(eval "(ocaml-run \"5 lor 3\")")
+(epoch 5262)
+(eval "(ocaml-run \"5 lxor 3\")")
+(epoch 5263)
+(eval "(ocaml-run \"1 lsl 8\")")
+(epoch 5264)
+(eval "(ocaml-run \"256 lsr 4\")")
+
 EPOCHS
 
 OUTPUT=$(timeout 360 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)
@@ -2392,6 +2404,13 @@ check 5251 "Either.fold Left 7+100"       '107'
 check 5252 "Either.fold Right 7*10"       '70'
 check 5253 "Hashtbl.copy independent"     '3'
 
+# ── Bitwise ops land/lor/lxor/lsl/lsr ───────────────────────────
+check 5260 "5 land 3 = 1"                 '1'
+check 5261 "5 lor 3 = 7"                  '7'
+check 5262 "5 lxor 3 = 6"                 '6'
+check 5263 "1 lsl 8 = 256"                '256'
+check 5264 "256 lsr 4 = 16"               '16'
+
 TOTAL=$((PASS + FAIL))
 if [ $FAIL -eq 0 ]; then
   echo "ok $PASS/$TOTAL OCaml-on-SX tests passed"