fix(test-utils): Use strict inequality for timestamp filter

Change from >= to > when filtering buffered events. This prevents stale
events from previous tests leaking through when they were buffered at
the same millisecond as the new listener started.

New events arriving after the listener is registered go through the
callback directly (not the buffer), so they're unaffected by this
filter.

Author: BYK

dev-packages/test-utils/src/event-proxy-server.ts

@@ -138,8 +138,12 @@ export async function startProxyServer(
 
     eventCallbackListeners.add(callbackListener);
 
+    // Use strict inequality to prevent stale events from previous tests leaking through.
+    // If a previous test's event was buffered at the same millisecond as this listener started,
+    // we want to exclude it. New events arriving after the listener is registered go through
+    // the callback directly (not the buffer), so they're not affected by this filter.
     eventBuffer.forEach(bufferedEvent => {
-      if (bufferedEvent.timestamp >= listenerTimestamp) {
+      if (bufferedEvent.timestamp > listenerTimestamp) {
         callbackListener(bufferedEvent.data);
       }
     });