feat(teacher): 连接 Yuxi 老师并提供项目与会话只读工具

shared/coding-teacher.ts

@@ -1,6 +1,9 @@
 import type { PublicUsage } from './coding-conversation-contracts';
 
 export interface TeacherDefinition {
+  config_id?: string;
+  runtime?: 'local' | 'yuxi';
+  yuxi?: { agent_slug: string; agent_version: number };
   schema_version: 1;
   teacher_id: 'coding-teacher';
   name: string;
@@ -29,6 +32,9 @@ export interface TeacherAvailability {
   published_version: number | null;
   revision: number;
 }
+export interface TeacherCatalog {
+  items: Array<{ teacher_id: string; version: number; definition: TeacherDefinition; is_default: boolean }>;
+}
 export interface TeacherReference {
   kind: 'message' | 'code';
   text: string;
@@ -67,6 +73,8 @@ export interface TeacherRequest {
   response: string;
   error?: string;
   usage?: PublicUsage;
+  cloudRequestId?: string;
+  progress?: string;
 }
 export interface TeacherTopic {
   revision: number;