centralize file filtering in FileDiscoveryService (#1039)

packages/core/src/core/client.ts

@@ -91,7 +91,7 @@ export class GeminiClient {
     });
     const platform = process.platform;
     const folderStructure = await getFolderStructure(cwd, {
-      fileService: await this.config.getFileService(),
+      fileService: this.config.getFileService(),
     });
     const context = `
   Okay, just setting up the context for our chat.