Recompile all 26 .sxbc with define-library wrappers + fix eval/JIT

All 26 browser modules recompiled with define-library/import forms.
Compilation works without vm-compile-adapter (JIT pre-compilation
hangs with library wrappers in some JIT paths — skipped for now,
CEK compilation is ~34s total).

Key fixes:
- eval command: import-aware loop that handles define-library/import
  locally without touching the Python bridge pipe (avoids deadlock)
- compile-modules.js: skip vm-compile-adapter, bump timeout

2621/2621 OCaml tests passing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

shared/static/wasm/sx/core-signals.sx

@@ -1,3 +1,32 @@
+
+
+(define-library (sx signals)
+  (export
+    make-signal
+    signal?
+    signal-value
+    signal-set-value!
+    signal-subscribers
+    signal-add-sub!
+    signal-remove-sub!
+    signal-deps
+    signal-set-deps!
+    signal
+    deref
+    reset!
+    swap!
+    computed
+    effect
+    *batch-depth*
+    *batch-queue*
+    batch
+    notify-subscribers
+    flush-subscribers
+    dispose-computed
+    with-island-scope
+    register-in-scope)
+  (begin
+
 (define
   make-signal
   (fn
@@ -193,3 +222,9 @@
     (let
       ((collector (scope-peek "sx-island-scope")))
       (when collector (cek-call collector (list disposable))))))
+
+
+)) ;; end define-library
+
+;; Re-export to global namespace for backward compatibility
+(import (sx signals))