WASM rebuild: IO suspension hook + all pending fixes

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

shared/static/wasm/sx-platform.js

@@ -57,6 +57,7 @@
     var obj = args[0], method = args[1];
     var callArgs = [];
     for (var i = 2; i < args.length; i++) callArgs.push(args[i]);
+    if (method === "addEventListener") console.log("[host-call] addEventListener args:", callArgs.map(a => typeof a === "function" ? "fn:" + (a.__host_callback ? "HOST_CB" : "other") : typeof a));
     if (obj == null) {
       // Global function call
       var fn = typeof globalThis !== "undefined" ? globalThis[method] : window[method];
@@ -157,12 +158,16 @@
     if (typeof fn === "function") return fn;
     // SX callable (has __sx_handle) — wrap as JS function
     if (fn && fn.__sx_handle !== undefined) {
-      return function() {
+      var wrappedFn = function() {
         var a = Array.prototype.slice.call(arguments);
+        console.log("[host-callback] FIRED handle=" + fn.__sx_handle);
         var r = K.callFn(fn, a);
+        console.log("[host-callback] callFn returned suspended=" + !!(r && r.suspended));
         if (window._driveAsync) window._driveAsync(r);
         return r;
       };
+      wrappedFn.__host_callback = true;
+      return wrappedFn;
     }
     return function() {};
   });