feat(agent): activate BOC agent layer

- Add agent orchestrator API (/api/v1/agents/*)
- Connect frontend AgentContext to real backend
- Add AgentLayerPage with full agent management
- Implement specialist agents: finance, sales, hr, crm, legal, marketing, dashboard
- Add authentication, RBAC, tenant isolation on agent endpoints
- Add rate limiting and audit logging
- Update sidebar with Agent Layer navigation
- Build fresh web-v2 dist

web-v2/src/components/layout/Sidebar.tsx

@@ -14,12 +14,14 @@ import {
   ChevronLeft,
   ChevronRight,
   Newspaper,
+  Bot,
 } from 'lucide-react'
 import { cn } from '@/lib/utils'
 
 const navItems = [
   { path: '/', label: 'Briefing', icon: Newspaper },
   { path: '/dashboard', label: 'Dashboard', icon: LayoutDashboard },
+  { path: '/agents', label: 'Agents', icon: Bot },
   { path: '/crm', label: 'CRM', icon: Users },
   { path: '/sales', label: 'Sales', icon: TrendingUp },
   { path: '/finance', label: 'Finance', icon: Wallet },