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/index.ts

@@ -22,6 +22,7 @@ import { taskAdd, taskList, taskShow, taskClose, taskUpdate } from './tools/crud
 import { taskSimilar, taskContext } from './tools/search.js';
 import { taskLink, checklistAdd, checklistToggle, taskResolveDuplicate } from './tools/relations.js';
 import { epicAdd, epicList, epicShow, epicAssign } from './tools/epics.js';
+import { taskDelegations, taskDelegationQuery } from './tools/delegations.js';
 
 // Create MCP server
 const server = new Server(
@@ -147,6 +148,18 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
         });
         break;
 
+      // Delegations
+      case 'task_delegations':
+        result = await taskDelegations({ task_id: a.task_id });
+        break;
+      case 'task_delegation_query':
+        result = await taskDelegationQuery({
+          status: a.status,
+          backend: a.backend,
+          limit: a.limit,
+        });
+        break;
+
       default:
         throw new Error(`Unknown tool: ${name}`);
     }