feat(rah-light): remove agent delegation system

- Delete src/services/agents/delegation.ts (AgentDelegationService)
- Delete app/api/rah/delegations/ directory (all routes)
- Delete src/components/agents/DelegationIndicator.tsx
- Update workflowExecutor.ts to work without delegation streaming
- Update executeWorkflow.ts tool to execute workflows directly
- Update quickAdd.ts to execute directly without delegation tracking
- Add stub AgentDelegation types to UI components for compatibility
- Add stub voice hooks to RAHChat.tsx (will be removed in story 2)

Files deleted:
- src/services/agents/delegation.ts
- app/api/rah/delegations/route.ts
- app/api/rah/delegations/stream/route.ts
- app/api/rah/delegations/[sessionId]/route.ts
- app/api/rah/delegations/[sessionId]/summary/route.ts
- src/components/agents/DelegationIndicator.tsx

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/panes/WorkflowsPane.tsx

@@ -3,8 +3,7 @@
 import { useState, useCallback, useEffect, useMemo } from 'react';
 import RAHChat from '@/components/agents/RAHChat';
 import PaneHeader from './PaneHeader';
-import { WorkflowsPaneProps, PaneType } from './types';
-import type { AgentDelegation } from '@/services/agents/delegation';
+import { WorkflowsPaneProps, PaneType, AgentDelegation } from './types';
 import { parseAndRenderContent } from '@/components/helpers/NodeLabelRenderer';
 import type { ChatMessage } from '@/components/agents/hooks/useSSEChat';
 

src/components/panes/types.ts

@@ -1,6 +1,18 @@
 import React from 'react';
 import { Node } from '@/types/database';
-import type { AgentDelegation } from '@/services/agents/delegation';
+
+// Stub type for delegation (delegation system removed in rah-light)
+export type AgentDelegation = {
+  id: number;
+  sessionId: string;
+  task: string;
+  context: string[];
+  status: 'queued' | 'in_progress' | 'completed' | 'failed';
+  summary?: string | null;
+  agentType: string;
+  createdAt: string;
+  updatedAt: string;
+};
 
 // The six pane types
 export type PaneType = 'node' | 'chat' | 'workflows' | 'dimensions' | 'map' | 'views';