fix(javascript-semantics): keep emitted data out of dispatch listener fields (#2952)

* fix(javascript-semantics): keep emitted data out of dispatch listener fields

The EventEmitter operation collector read argument position 1 as the
listener for every event method, so a dispatch such as
bus.emit("ready", data) reported the data binding and its range as the
listener. Only registration and removal name a listener there; emit
passes its remaining arguments to listeners that already exist. Read the
listener argument only for register and remove operations.

Fixes #2574

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* fix(javascript-semantics): read listener arguments only for listener-taking methods

removeAllListeners accepts only an optional event name, so gating the
listener argument on operation kind still reported an ignored second
argument as a listener. Gate on the methods whose argument position 1
names a listener instead: the registration methods, off, and
removeListener.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

src/domain/javascript/javascriptSemanticAsyncEffects.ts

@@ -37,6 +37,13 @@ const EVENT_REMOVE_METHODS = [
   "removeListener",
   "removeAllListeners",
 ] as const;
+/**
+ * Methods whose argument position 1 names a listener. `removeAllListeners`
+ * takes only an optional event name, and `emit` passes its remaining
+ * arguments as data to listeners that already exist.
+ */
+const EVENT_LISTENER_METHODS: readonly JavaScriptSemanticEventOperation["method"][] =
+  [...EVENT_REGISTER_METHODS, "off", "removeListener"];
 const EVENT_METHODS = [
   ...EVENT_REGISTER_METHODS,
   ...EVENT_REMOVE_METHODS,
@@ -137,7 +144,9 @@ const collectEvent = (
   if (method === undefined) return;
   const kind = eventKind(method);
   const eventArgument = node.arguments[0];
-  const listenerArgument = node.arguments[1];
+  const listenerArgument = EVENT_LISTENER_METHODS.includes(method)
+    ? node.arguments[1]
+    : undefined;
   const emitter = emitterIdentity(member.object, state);
   const eventName = dataEffectLiteralString(eventArgument);
   output.push({