fix: Disable EventEmitter maxListeners warning for SSE subscriptions

Each SSE client registers a listener per event type (30+ types), so a
few concurrent connections easily exceed the previous limit of 100.
Listeners are properly cleaned up on disconnect via eventBusIterable's
finally block, so this is not a real leak.

apps/server/test/integration/real-providers/harness.ts

@@ -205,7 +205,7 @@ export async function createRealProviderHarness(
   const accountRepository = new DrizzleAccountRepository(db);
   const initiativeRepository = new DrizzleInitiativeRepository(db);
 
-  // Create event bus with capture (parent class already sets maxListeners to 100)
+  // Create event bus with capture (parent class disables maxListeners warning)
   const eventBus = new CapturingEventBus();
 
   // Create REAL agent manager (not mock!)