feat: Add delegation tracking MCP tools

Session 374: Task-MCP and Delegation System Integration (Phase 4 & 6)

- Add task_delegations tool: query delegations for a specific task
- Add task_delegation_query tool: query across all tasks by status/backend
- Enhance taskShow() to display recent delegation history
- New delegations.ts module with getRecentDelegations helper

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

src/tools/crud.ts

@@ -3,6 +3,7 @@
 import { query, queryOne, execute, getNextTaskId, getProjectKey } from '../db.js';
 import { getEmbedding, formatEmbedding } from '../embeddings.js';
 import type { Task, ChecklistItem, TaskLink } from '../types.js';
+import { getRecentDelegations } from './delegations.js';
 
 interface TaskAddArgs {
   title: string;
@@ -225,6 +226,12 @@ export async function taskShow(id: string): Promise<string> {
     }
   }
 
+  // Get recent delegations
+  const delegationHistory = await getRecentDelegations(id);
+  if (delegationHistory) {
+    output += delegationHistory;
+  }
+
   return output;
 }