refactor(core): 整理工具描述文件目录结构

将 checkpoint 和 repomap 相关的描述文件移动到各自的子目录

packages/core/src/tools/load_description.ts

@@ -40,6 +40,14 @@ const TOOL_CATEGORY_MAP: Record<string, string> = {
   // task
   task: 'task',
   agent_output: 'task',
+  // checkpoint
+  checkpoint_create: 'checkpoint',
+  checkpoint_list: 'checkpoint',
+  checkpoint_diff: 'checkpoint',
+  checkpoint_restore: 'checkpoint',
+  undo: 'checkpoint',
+  // repomap
+  repo_map: 'repomap',
 };
 
 export function loadDescription(toolName: string): string {