fix: Remove agent:output from general SSE subscriptions to prevent listener leak

agent:output is high-frequency streaming data that was included in
ALL_EVENT_TYPES and AGENT_EVENT_TYPES, causing every onEvent/onAgentUpdate
SSE subscription to register a listener. With multiple subscriptions per
browser tab plus reconnections, this exceeded the 100 listener limit.

The dedicated onAgentOutput subscription handles output streaming already.
Bonus: stops useLiveUpdates from refetching listAgents on every output chunk.

apps/server/trpc/subscriptions.ts

@@ -40,7 +40,6 @@ export const ALL_EVENT_TYPES: DomainEventType[] = [
   'agent:account_switched',
   'agent:deleted',
   'agent:waiting',
-  'agent:output',
   'task:queued',
   'task:dispatched',
   'task:completed',
@@ -84,7 +83,6 @@ export const AGENT_EVENT_TYPES: DomainEventType[] = [
   'agent:account_switched',
   'agent:deleted',
   'agent:waiting',
-  'agent:output',
 ];
 
 /**