feat(task-mcp): Add task_resolve_duplicate tool

Combines close + link operations for duplicate issues:
- Closes the duplicate task (sets status to completed)
- Creates bidirectional 'duplicates' link to dominant task

Usage: task_resolve_duplicate(duplicate_id, dominant_id)

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

src/index.ts

@@ -20,7 +20,8 @@ import { testConnection, close } from './db.js';
 import { toolDefinitions } from './tools/index.js';
 import { taskAdd, taskList, taskShow, taskClose, taskUpdate } from './tools/crud.js';
 import { taskSimilar, taskContext } from './tools/search.js';
-import { taskLink, checklistAdd, checklistToggle } from './tools/relations.js';
+import { taskLink, checklistAdd, checklistToggle, taskResolveDuplicate } from './tools/relations.js';
+import { epicAdd, epicList, epicShow, epicAssign } from './tools/epics.js';
 
 // Create MCP server
 const server = new Server(
@@ -114,6 +115,37 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
           checked: a.checked,
         });
         break;
+      case 'task_resolve_duplicate':
+        result = await taskResolveDuplicate({
+          duplicate_id: a.duplicate_id,
+          dominant_id: a.dominant_id,
+        });
+        break;
+
+      // Epics
+      case 'epic_add':
+        result = await epicAdd({
+          title: a.title,
+          project: a.project,
+          description: a.description,
+        });
+        break;
+      case 'epic_list':
+        result = await epicList({
+          project: a.project,
+          status: a.status,
+          limit: a.limit,
+        });
+        break;
+      case 'epic_show':
+        result = await epicShow(a.id);
+        break;
+      case 'epic_assign':
+        result = await epicAssign({
+          task_id: a.task_id,
+          epic_id: a.epic_id,
+        });
+        break;
 
       default:
         throw new Error(`Unknown tool: ${name}`);