js-on-sx: expanded Math + Number globals

Math gains sqrt/pow/trunc/sign/cbrt/hypot plus LN2/LN10/LOG2E/
LOG10E/SQRT2/SQRT1_2 constants and full-precision PI/E.

Number global: isFinite/isNaN/isInteger/isSafeInteger plus
MAX_VALUE/MIN_VALUE/MAX_SAFE_INTEGER/MIN_SAFE_INTEGER/EPSILON/
POSITIVE_INFINITY/NEGATIVE_INFINITY/NaN.

Global isFinite, isNaN, Infinity, NaN. Wired into js-global.

329/331 unit (+21), 148/148 slice unchanged.

lib/js/test.sh

@@ -829,6 +829,52 @@ cat > "$TMPFILE" << 'EPOCHS'
 (epoch 1061)
 (eval "(js-eval \"/zzz/.test('hello')\")")
 
+;; ── Phase 11.math: expanded constants + functions ────────────────
+(epoch 1100)
+(eval "(js-eval \"Math.sqrt(16)\")")
+(epoch 1101)
+(eval "(js-eval \"Math.pow(2, 10)\")")
+(epoch 1102)
+(eval "(js-eval \"Math.trunc(3.7)\")")
+(epoch 1103)
+(eval "(js-eval \"Math.trunc(-3.7)\")")
+(epoch 1104)
+(eval "(js-eval \"Math.sign(5)\")")
+(epoch 1105)
+(eval "(js-eval \"Math.sign(-5)\")")
+(epoch 1106)
+(eval "(js-eval \"Math.sign(0)\")")
+(epoch 1107)
+(eval "(js-eval \"Math.hypot(3, 4)\")")
+(epoch 1108)
+(eval "(js-eval \"Math.cbrt(27)\")")
+(epoch 1109)
+(eval "(js-eval \"Math.PI > 3.14\")")
+(epoch 1110)
+(eval "(js-eval \"Math.E > 2.7\")")
+(epoch 1111)
+(eval "(js-eval \"Math.SQRT2 > 1.41\")")
+
+;; ── Phase 11.number: Number builtin ─────────────────────────────
+(epoch 1200)
+(eval "(js-eval \"Number.isInteger(5)\")")
+(epoch 1201)
+(eval "(js-eval \"Number.isInteger(5.5)\")")
+(epoch 1202)
+(eval "(js-eval \"Number.isFinite(5)\")")
+(epoch 1203)
+(eval "(js-eval \"Number.isFinite(1/0)\")")
+(epoch 1204)
+(eval "(js-eval \"Number.isSafeInteger(1)\")")
+(epoch 1205)
+(eval "(js-eval \"Number.MAX_SAFE_INTEGER\")")
+(epoch 1206)
+(eval "(js-eval \"Number.EPSILON > 0\")")
+(epoch 1207)
+(eval "(js-eval \"isFinite(1)\")")
+(epoch 1208)
+(eval "(js-eval \"isFinite(1/0)\")")
+
 EPOCHS
 
 OUTPUT=$(timeout 180 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)
@@ -1270,6 +1316,30 @@ check 1053 "literal .ignoreCase"            'true'
 check 1060 "test match"                     'true'
 check 1061 "test no match"                  'false'
 
+# ── Phase 11.math: expanded Math ────────────────────────────────
+check 1100 "Math.sqrt(16)"                  '4'
+check 1101 "Math.pow(2,10)"                 '1024'
+check 1102 "Math.trunc(3.7)"                '3'
+check 1103 "Math.trunc(-3.7)"               '-3'
+check 1104 "Math.sign(5)"                   '1'
+check 1105 "Math.sign(-5)"                  '-1'
+check 1106 "Math.sign(0)"                   '0'
+check 1107 "Math.hypot(3,4)"                '5'
+check 1108 "Math.cbrt(27)"                  '3'
+check 1109 "Math.PI"                        'true'
+check 1110 "Math.E"                         'true'
+check 1111 "Math.SQRT2"                     'true'
+
+check 1200 "Number.isInteger(5)"           'true'
+check 1201 "Number.isInteger(5.5)"         'false'
+check 1202 "Number.isFinite(5)"            'true'
+check 1203 "Number.isFinite(Inf)"          'false'
+check 1204 "Number.isSafeInteger(1)"       'true'
+check 1205 "Number.MAX_SAFE_INTEGER"       '9007199254740991'
+check 1206 "Number.EPSILON > 0"            'true'
+check 1207 "isFinite(1)"                   'true'
+check 1208 "isFinite(Inf)"                 'false'
+
 TOTAL=$((PASS + FAIL))
 if [ $FAIL -eq 0 ]; then
   echo "✓ $PASS/$TOTAL JS-on-SX tests passed"