fix(team-mode): remove duplicate teamSessionStreamer dispatch in event.ts

The teamSessionStreamer hook was registered inside dispatchToHooks() at
line 275 AND invoked again directly at line 390, causing every message
event to be processed twice. Remove the outer invocation - the one
inside dispatchToHooks is enough and runs for every event.

Oracle review blocker (reported by oracle session verifying #3493).

Author: code-yeongyu

src/plugin/event.ts

@@ -387,8 +387,6 @@ export function createEventHandler(args: {
     const { event } = input;
     const props = event.properties as Record<string, unknown> | undefined;
 
-    await runEventHookSafely("teamSessionStreamer", teamSessionStreamer?.event, input);
-
     if (tmuxIntegrationEnabled && TMUX_ACTIVITY_EVENT_TYPES.has(event.type)) {
       managers.tmuxSessionManager.onEvent?.(event as { type: string; properties?: Record<string, unknown> });
     }