js-on-sx: js-to-number throws TypeError on non-primitive

Mirrors the earlier js-to-string fix. Number(obj) must throw
if ToPrimitive cannot extract a primitive (both valueOf and
toString return objects). Was returning NaN silently. Replaced
the inner (js-nan-value) fallback with (raise (js-new-call
TypeError ...)).
built-ins/Number: 45/50 → 46/50. conformance.sh: 148/148.

lib/js/test262-scoreboard.md

@@ -1,24 +1,24 @@
 # test262 scoreboard
 
 Pinned commit: `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`
-Wall time: 38.2s
+Wall time: 90.4s
 
-**Total:** 44/50 runnable passed (88.0%). Raw: pass=44 fail=6 skip=0 timeout=0 total=50.
+**Total:** 46/50 runnable passed (92.0%). Raw: pass=46 fail=2 skip=0 timeout=2 total=50.
 
 ## Top failure modes
 
-- **4x** ReferenceError (undefined symbol)
-- **2x** SyntaxError (parse/unsupported syntax)
+- **2x** Timeout
+- **2x** Test262Error (assertion failed)
 
 ## Categories (worst pass-rate first, min 10 runnable)
 
 | Category | Pass | Fail | Skip | Timeout | Total | Pass % |
 |---|---:|---:|---:|---:|---:|---:|
-| built-ins/Object | 44 | 6 | 0 | 0 | 50 | 88.0% |
+| built-ins/Number | 46 | 2 | 0 | 2 | 50 | 92.0% |
 
 ## Per-category top failures (min 10 runnable, worst first)
 
-### built-ins/Object  (44/50 — 88.0%)
+### built-ins/Number  (46/50 — 92.0%)
 
-- **4x** ReferenceError (undefined symbol)
-- **2x** SyntaxError (parse/unsupported syntax)
+- **2x** Timeout
+- **2x** Test262Error (assertion failed)