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>

frontend/src/api/agent.ts

@@ -7,6 +7,14 @@ export interface AgentStats {
   status: 'active' | 'idle' | 'disabled'
 }
 
+export interface AgentHierarchyStatsNode extends AgentStats {
+  sub_commanders: AgentStats[]
+}
+
+export interface AgentHierarchyStats {
+  main_agents: AgentHierarchyStatsNode[]
+}
+
 export interface AgentConfig {
   id: string
   name: string
@@ -22,6 +30,11 @@ export const agentApi = {
     return res.data
   },
 
+  async getHierarchyStats(): Promise<AgentHierarchyStats> {
+    const res = await api.get('/api/agents/stats/hierarchy')
+    return res.data
+  },
+
   async getConfig(id: string): Promise<AgentConfig> {
     const res = await api.get(`/api/agents/config/${id}`)
     return res.data