Read and write files through Zed (#6169)

Co-authored-by: Agus Zubiaga <agus@zed.dev>

packages/cli/src/ui/hooks/atCommandProcessor.test.ts

@@ -11,6 +11,7 @@ import {
   FileDiscoveryService,
   GlobTool,
   ReadManyFilesTool,
+  StandardFileSystemService,
   ToolRegistry,
 } from '@google/gemini-cli-core';
 import * as os from 'os';
@@ -56,6 +57,7 @@ describe('handleAtCommand', () => {
         respectGitIgnore: true,
         respectGeminiIgnore: true,
       }),
+      getFileSystemService: () => new StandardFileSystemService(),
       getEnableRecursiveFileSearch: vi.fn(() => true),
       getWorkspaceContext: () => ({
         isPathWithinWorkspace: () => true,