fix(coding-teacher): restore context and read project files

electron/coding-teacher/service.ts

@@ -276,7 +276,13 @@ export class CodingTeacherService {
         throw new TeacherError(422, 'teacher_definition_invalid', '请先配置老师的系统提示词。');
       const model = await (this.options.prepareModel ?? prepareTeacherModel)(
         account,
-        topic.definition
+        topic.definition,
+        scope.projectId === 'preview' ? undefined : {
+          projectPath: (await this.options.projects.getProject(scope.projectId)).path,
+          source,
+          history: topic.requests,
+          assertCurrent: () => this.assertAccount(account),
+        }
       );
       const compiled = compileTeacherContext(
         topic.definition,
@@ -284,7 +290,8 @@ export class CodingTeacherService {
         topic.requests,
         input.text,
         references,
-        model.inputLimit
+        model.inputLimit,
+        scope.projectId !== 'preview'
       );
       const request = {
         id: input.requestId,
@@ -295,6 +302,7 @@ export class CodingTeacherService {
         sourceCapturedAt: source.capturedAt,
         includedSourceMessageIds: compiled.includedSourceMessageIds,
         omittedMessages: compiled.omittedMessages,
+        truncatedMessages: compiled.truncatedMessages,
         status: 'preparing' as const,
         response: '',
       };