js-on-sx: updated Math scoreboard — 66/288 (22.9%)

Up from 56/288 (19.4%) baseline. Progress from:
- Math.sqrt/pow/trunc/sign/cbrt/hypot
- Array.prototype stubs for verifyProperty
- typeof callable-dict → "function"
- __callable__ dispatch in js-apply-fn

lib/js/test262-scoreboard.md

@@ -1,18 +1,31 @@
 # test262 scoreboard
 
 Pinned commit: `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`
-Wall time: 14.2s
+Wall time: 275.0s
 
-**Total:** 3/7 runnable passed (42.9%). Raw: pass=3 fail=4 skip=1 timeout=0 total=8.
+**Total:** 66/288 runnable passed (22.9%). Raw: pass=66 fail=206 skip=39 timeout=16 total=327.
 
 ## Top failure modes
 
-- **2x** ReferenceError (undefined symbol)
-- **2x** Test262Error (assertion failed)
+- **94x** ReferenceError (undefined symbol)
+- **79x** Test262Error (assertion failed)
+- **31x** TypeError: not a function
+- **16x** Timeout
+- **1x** Unhandled: Not callable: {:random <js-math-random()> :trunc <js-math-tr
+- **1x** SyntaxError (parse/unsupported syntax)
 
 ## Categories (worst pass-rate first, min 10 runnable)
 
 | Category | Pass | Fail | Skip | Timeout | Total | Pass % |
 |---|---:|---:|---:|---:|---:|---:|
+| built-ins/Math | 66 | 206 | 39 | 16 | 327 | 22.9% |
 
 ## Per-category top failures (min 10 runnable, worst first)
+
+### built-ins/Math  (66/288 — 22.9%)
+
+- **94x** ReferenceError (undefined symbol)
+- **79x** Test262Error (assertion failed)
+- **31x** TypeError: not a function
+- **16x** Timeout
+- **1x** Unhandled: Not callable: {:random <js-math-random()> :trunc <js-math-tr