feat(tools): add barrel exports and allBuiltinTools list

src/tools/builtin/index.ts

@@ -0,0 +1,23 @@
+export { shellExecTool } from './shell.js';
+export { fileReadTool } from './file-read.js';
+export { fileWriteTool } from './file-write.js';
+export { fileEditTool } from './file-edit.js';
+export { fileListTool } from './file-list.js';
+export { webFetchTool } from './web-fetch.js';
+
+import type { Tool } from '../types.js';
+import { shellExecTool } from './shell.js';
+import { fileReadTool } from './file-read.js';
+import { fileWriteTool } from './file-write.js';
+import { fileEditTool } from './file-edit.js';
+import { fileListTool } from './file-list.js';
+import { webFetchTool } from './web-fetch.js';
+
+export const allBuiltinTools: Tool[] = [
+  shellExecTool,
+  fileReadTool,
+  fileWriteTool,
+  fileEditTool,
+  fileListTool,
+  webFetchTool,
+];