fix(mcp): fix server startup crash from type-only re-export

esbuild was stripping TaskPriority/TaskStatus (type-only exports)
from the JS output, but runtime import still expected them as values.
Changed to `export type` and fixed import path to types/task.js.

Also fixed claude_desktop_config.json: wrong dist path and Node v16.

Author: StackMemory Bot (CLI)

src/integrations/mcp/server.ts

@@ -42,10 +42,7 @@ type LinearAuthManager = import('../linear/auth.js').LinearAuthManager;
 type LinearSyncEngine = import('../linear/sync.js').LinearSyncEngine;
 
 // Re-export task types for handlers (these are just enums/types, not runtime deps)
-export {
-  TaskPriority,
-  TaskStatus,
-} from '../../features/tasks/linear-task-manager.js';
+export type { TaskPriority, TaskStatus } from '../../types/task.js';
 import { BrowserMCPIntegration } from '../../features/browser/browser-mcp.js';
 import { TraceDetector } from '../../core/trace/trace-detector.js';
 import { ToolCall, _Trace } from '../../core/trace/types.js';