ocaml: phase 6 Float module: sqrt/sin/cos/pow/floor/ceil/round/pi (+6 tests, 378 total)

Wraps host SX math primitives via _float_* builtins. Float.pi is a
Float literal in the OCaml-side module.

lib/ocaml/test.sh

@@ -922,6 +922,20 @@ cat > "$TMPFILE" << 'EPOCHS'
 (epoch 2304)
 (eval "(ocaml-type-of \"fun x y -> x +. y\")")
 
+;; ── Float module ───────────────────────────────────────────────
+(epoch 2400)
+(eval "(ocaml-run \"Float.sqrt 16.0\")")
+(epoch 2401)
+(eval "(ocaml-run \"Float.sin 0.0\")")
+(epoch 2402)
+(eval "(ocaml-run \"Float.cos 0.0\")")
+(epoch 2403)
+(eval "(ocaml-run \"Float.pow 2.0 10.0\")")
+(epoch 2404)
+(eval "(ocaml-run \"Float.floor 3.7\")")
+(epoch 2405)
+(eval "(ocaml-run \"Float.ceil 3.2\")")
+
 EPOCHS
 
 OUTPUT=$(timeout 180 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)
@@ -1458,6 +1472,14 @@ check 2302 "10.0 /. 4.0"                  '2.5'
 check 2303 "type 1.5 +. 2.5"              '"Float"'
 check 2304 "type fun x y -> x +. y"       '"Float -> Float -> Float"'
 
+# ── Float module ────────────────────────────────────────────────
+check 2400 "Float.sqrt 16"                '4'
+check 2401 "Float.sin 0"                  '0'
+check 2402 "Float.cos 0"                  '1'
+check 2403 "Float.pow 2 10"               '1024'
+check 2404 "Float.floor 3.7"              '3'
+check 2405 "Float.ceil 3.2"               '4'
+
 TOTAL=$((PASS + FAIL))
 if [ $FAIL -eq 0 ]; then
   echo "ok $PASS/$TOTAL OCaml-on-SX tests passed"