Update agent orchestration and knowledge flow

Add sub-commander orchestration updates, align frontend integrations, and refine knowledge view behavior without including local data artifacts.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/agents/state.py

@@ -55,6 +55,9 @@ class AgentState(TypedDict):
     # Agent routing
     current_agent: AgentRole
     active_agents: list[AgentRole]
+    current_sub_commander: str | None
+    active_sub_commanders: list[str]
+    sub_commander_trace: list[dict]
 
     # Task tracking
     pending_tasks: list[dict]
@@ -93,6 +96,9 @@ def initial_state(user_id: str, conversation_id: str) -> AgentState:
         conversation_id=conversation_id,
         current_agent=AgentRole.MASTER,
         active_agents=[AgentRole.MASTER],
+        current_sub_commander=None,
+        active_sub_commanders=[],
+        sub_commander_trace=[],
         pending_tasks=[],
         completed_tasks=[],
         tool_calls=[],