test(sync): allow repeated relay e2e startup

server/index.js

@@ -1137,7 +1137,8 @@ export async function stopServerForTests() {
     peerJoinLocks.clear();
     clearRateLimitMaps();
     healthResponseCache.clear();
-    io.removeAllListeners();
+    // Keep the server's connection handler installed so an E2E process can
+    // stop and restart this singleton relay for a later isolated scenario.
     io.disconnectSockets(true);
     Object.assign(rateLimitDenied, { connections: 0, events: 0, health: 0, adminMetricsAuth: 0, roomList: 0, leaveRoom: 0 });
     if (!httpServer.listening) return;

tests/e2e/extension.spec.mjs

@@ -422,7 +422,10 @@ test('recovers relay ROOM_DATA through background retries into the packed player
                             const attempts = Number(video.dataset.koalaCanonicalPlayAttempts || '0') + 1;
                             video.dataset.koalaCanonicalPlayAttempts = String(attempts);
                             if (attempts === 1) {
-                                return Promise.reject(new DOMException('audit autoplay rejection', 'NotAllowedError'));
+                                return Promise.reject(Object.assign(
+                                    new Error('audit autoplay rejection'),
+                                    { name: 'NotAllowedError' }
+                                ));
                             }
                             return nativePlay();
                         }