Simplify streaming code for code assist server (#4619)

packages/core/src/core/client.ts

@@ -22,6 +22,7 @@ import {
   ChatCompressionInfo,
 } from './turn.js';
 import { Config } from '../config/config.js';
+import { UserTierId } from '../code_assist/types.js';
 import { getCoreSystemPrompt, getCompressionPrompt } from './prompts.js';
 import { ReadManyFilesTool } from '../tools/read-many-files.js';
 import { getResponseText } from '../utils/generateContentResponseUtilities.js';
@@ -130,6 +131,10 @@ export class GeminiClient {
     return this.contentGenerator;
   }
 
+  getUserTier(): UserTierId | undefined {
+    return this.contentGenerator?.userTier;
+  }
+
   async addHistory(content: Content) {
     this.getChat().addHistory(content);
   }