refactor(teacher): retire discussion components and keep text replies

electron/coding-teacher/service.ts

@@ -9,7 +9,6 @@ import type {
   TeacherCheckInInput,
   TeacherCheckInResult,
   TeacherDefinition,
-  TeacherDiscussionAction,
   TeacherReference,
   TeacherSend,
   TeacherSourceContext,
@@ -31,8 +30,7 @@ import { compileTeacherContext } from './context';
 import { prepareTeacherModel } from './model-runner';
 import { prepareCloudTeacher } from './cloud-runner';
 import { readTeacherSource } from './source-reader';
-import { parseTeacherSuggestions } from './suggestions';
-import { applyDiscussionReply, discussionInstructions, editDiscussion, validateDiscussionContext } from './discussion';
+import { applyTeacherReply, teacherReplyInstructions } from './reply';
 import { subscribeWorksSquareSession } from '../services/works-square-session';
 
 export interface TeacherScope {
@@ -317,11 +315,7 @@ export class CodingTeacherService {
   ): Promise<TeacherTopic> {
     teacherTopicId(input.requestId);
     const intent = input.intent === undefined ? 'question' : input.intent;
-    if (input.presentation !== undefined && input.presentation !== 'discussion-v1')
-      throw new TeacherError(422, 'teacher_presentation_invalid', '智能体的显示方式无效。');
-    if (input.discussion !== undefined && input.presentation !== 'discussion-v1')
-      throw new TeacherError(422, 'teacher_discussion_invalid', '讨论方式无效。');
-    const structuredReply = input.presentation === 'discussion-v1' && (intent === 'question' || intent === 'guided-help');
+    const structuredReply = intent !== 'check-in';
     if (!['question', 'suggestions', 'guided-help', 'check-in'].includes(intent) || (intent === 'check-in' && !checkIn))
       throw new TeacherError(422, 'teacher_intent_invalid', '提问方式无效，请重新打开智能体后再试。');
     if (intent !== 'question' && (
@@ -355,9 +349,7 @@ export class CodingTeacherService {
           existing.text !== input.text ||
           (existing.intent ?? 'question') !== intent ||
           JSON.stringify(existing.references) !== JSON.stringify(refs) ||
-          (existing.sourceConversationId ?? undefined) !== (input.sourceConversationId ?? undefined) ||
-          existing.presentation !== input.presentation ||
-          JSON.stringify(existing.discussionContext) !== JSON.stringify(input.discussion)
+          (existing.sourceConversationId ?? undefined) !== (input.sourceConversationId ?? undefined)
         )
           throw new TeacherError(409, 'teacher_request_conflict', '同一请求标识不能用于不同问题。');
         return structuredClone(topic);
@@ -369,7 +361,6 @@ export class CodingTeacherService {
         )
       )
         throw new TeacherError(409, 'teacher_topic_busy', '请等待当前回复完成，或先停止。');
-      const discussionContext = validateDiscussionContext(topic, input.discussion);
       if (topic.draftRevision) {
         await (this.options.preview ?? teacherPreview)(account, topic.draftRevision);
       } else if (topic.definition.runtime !== 'yuxi' && topic.definition.config_id) {
@@ -455,7 +446,7 @@ export class CodingTeacherService {
           })
         : await (this.options.prepareModel ?? prepareTeacherModel)(account, topic.definition,
           access,
-          { finalOnly: structuredReply || intent === 'suggestions' });
+          { finalOnly: structuredReply });
       if (checkIn) this.assertAccount(account);
       const compiled = compileTeacherContext(
         topic.definition,
@@ -465,7 +456,7 @@ export class CodingTeacherService {
         references,
         model.inputLimit,
         intent,
-        structuredReply ? discussionInstructions(topic, discussionContext) : undefined,
+        structuredReply ? teacherReplyInstructions() : undefined,
         scope.projectId !== 'preview',
         model.measureInput
       );
@@ -485,8 +476,7 @@ export class CodingTeacherService {
       const request = {
         id: input.requestId,
         intent,
-        ...(input.presentation ? { presentation: input.presentation } : {}),
-        ...(discussionContext ? { discussionContext } : {}),
+        ...(structuredReply ? { presentation: 'reply-v1' as const } : {}),
         ...(input.sourceConversationId ? { sourceConversationId: input.sourceConversationId } : {}),
         ...(checkIn ? { checkInSourceFingerprint: checkIn.fingerprint } : {}),
         text: input.text,
@@ -518,13 +508,13 @@ export class CodingTeacherService {
       const release = this.options.acquireLease?.(key) ?? (() => undefined);
       const finish = async () => {
         const current = topic.requests.at(-1)!;
+        let structuredText = '';
         try {
           this.assertAccount(account);
           if (controller.signal.aborted) throw controller.signal.reason;
           current.status = 'running';
           topic.revision++;
           this.events.emit(key, structuredClone(topic));
-          let structuredText = '';
           current.usage = await model.run(compiled.messages, controller.signal, (delta) => {
             if (structuredReply) { structuredText += delta; return; }
             current.response += delta;
@@ -532,12 +522,7 @@ export class CodingTeacherService {
             this.events.emit(key, structuredClone(topic));
           });
           this.assertAccount(account);
-          if (!controller.signal.aborted && structuredReply) applyDiscussionReply(topic, current, structuredText);
-          if (!controller.signal.aborted && intent === 'suggestions') {
-            const suggestions = parseTeacherSuggestions(current.response);
-            current.response = suggestions.intro;
-            current.suggestedQuestions = suggestions.questions;
-          }
+          if (!controller.signal.aborted && structuredReply) applyTeacherReply(current, structuredText);
           current.status = controller.signal.aborted ? 'cancelled' : 'completed';
         } catch (error) {
           current.status = controller.signal.aborted ? 'cancelled' : 'failed';
@@ -547,6 +532,9 @@ export class CodingTeacherService {
               ? error.message
               : '智能体回复失败，已保留本次问题与收到的内容。';
         } finally {
+          // Keep received bytes inert even when an aborted runner resolves normally.
+          if (structuredReply && current.status !== 'completed' && structuredText)
+            current.unparsedResponse = structuredText;
           if (intent === 'suggestions' && current.status !== 'completed') {
             current.response = '';
             delete current.suggestedQuestions;
@@ -569,24 +557,6 @@ export class CodingTeacherService {
       return structuredClone(topic);
     });
   }
-  async updateDiscussion(scope: TeacherScope, id: string, input: TeacherDiscussionAction) {
-    const account = await this.account();
-    this.assertWritable(scope);
-    const key = this.key(account, scope, id);
-    return await this.serialize(key, async () => {
-      const { store, topic } = await this.readOwned(account, scope, id);
-      if (this.active.has(key) || topic.requests.some(request => ['preparing', 'running'].includes(request.status)))
-        throw new TeacherError(409, 'teacher_topic_busy', '请等待智能体回复，或先停止。');
-      const next = structuredClone(topic);
-      editDiscussion(next, input);
-      next.revision++;
-      next.updatedAt = new Date().toISOString();
-      this.assertAccount(account);
-      await store.save(next);
-      this.events.emit(key, structuredClone(next));
-      return structuredClone(next);
-    });
-  }
   async cancel(scope: TeacherScope, id: string, requestId: string) {
     const account = await this.account();
     const { topic } = await this.readOwned(account, scope, id);