fix: preserve complete consultation replies and recover retained history

electron/coding-teacher/context.ts

@@ -62,12 +62,12 @@ export function teacherHistoryMessages(history: TeacherRequest[]): TeacherSource
       id: 'teacher:' + request.id + ':user', role: 'user' as const,
       text: [...request.references.map(ref => '明确引用：\n' + ref.text), request.text].join('\n\n'),
     }]),
-    {
+    ...(request.replyIncomplete ? [] : [{
       id: 'teacher:' + request.id + ':assistant', role: 'assistant' as const,
       text: [request.response, ...(request.suggestedQuestions?.length
         ? ['可以接着聊的问题：\n' + request.suggestedQuestions.map(text => '- ' + text).join('\n')]
         : [])].join('\n\n'),
-    },
+    }]),
   ]);
 }
 // A bounded text estimate for the native model path, not an exact tokenizer or