fix: enable parallel analyst execution by removing broken TeamMsgHub import

backend/core/pipeline.py

@@ -72,12 +72,10 @@ def _resolve_evo_agent_ids() -> set[str]:
 # Team infrastructure imports (graceful import - may not exist yet)
 try:
     from backend.agents.team.team_coordinator import TeamCoordinator
-    from backend.agents.team.msg_hub import MsgHub as TeamMsgHub
     TEAM_COORD_AVAILABLE = True
 except ImportError:
     TEAM_COORD_AVAILABLE = False
     TeamCoordinator = None
-    TeamMsgHub = None
 
 
 logger = logging.getLogger(__name__)