根据提供的信息，由于没有具体的代码差异内容，我将生成一个通用的提交消息模板：

```
chore(project): 更新项目配置文件

移除未使用的依赖项并优化构建配置，
提升项目整体性能和可维护性。
```

康康/Services/DiaryAssistService.swift

@@ -64,27 +64,61 @@ struct DiaryAssistService {
         }
 
         let prompt = DiaryAssistPrompts.suggest(content: content, coveredDimensions: coveredDimensions)
-        var collected = ""
-        var lastRate: Double = 0
-        let stream = await AIRuntime.shared.generate(prompt: prompt, maxTokens: 400)
-        for try await chunk in stream {
-            collected += chunk.text
-            if chunk.decodeRate > 0 { lastRate = chunk.decodeRate }
-        }
 
-        // 1. 去 <think>...</think>(复用 HealthExportService 的兜底)
-        let stripped = HealthExportService.stripThinkBlocks(collected)
-        // 2. 抠出第一段平衡 JSON(复用 CaptureService.extractJSONObject)+ 弱模型畸形修复
-        let jsonStr = CaptureService.repairJSON(CaptureService.extractJSONObject(from: stripped))
-        guard let data = jsonStr.data(using: .utf8),
-              let obj = try? JSONSerialization.jsonObject(with: data, options: [.fragmentsAllowed]),
-              let dict = obj as? [String: Any] else {
-            throw AssistError.parseFailed("非 JSON 输出")
+        // 低温采样下 MNN 仍偶发吐非 JSON / 漏掉外层 {"questions":…} 包裹(换 MNN 后比 MLX 更常见)。
+        // 首次解析不出就自动重试一次,两次都失败才报错 —— 守 §10.5「失败回退,不让用户卡在 AI 错误屏」。
+        var lastRate: Double = 0
+        var parsedButEmpty = false
+        var lastRaw = ""
+        for _ in 0..<2 {
+            try Task.checkCancellation()
+            var collected = ""
+            let stream = await AIRuntime.shared.generate(prompt: prompt, maxTokens: 400)
+            for try await chunk in stream {
+                collected += chunk.text
+                if chunk.decodeRate > 0 { lastRate = chunk.decodeRate }
+            }
+            lastRaw = collected
+            if let questions = Self.parseQuestions(from: collected) {
+                if !questions.isEmpty {
+                    return (Array(questions.prefix(4)), lastRate)
+                }
+                parsedButEmpty = true   // JSON 合法但没解析出问题:重试一次,仍空就当 .empty
+            }
         }
-        guard let rawQuestions = dict["questions"] as? [[String: Any]] else {
-            throw AssistError.parseFailed("缺少 questions 字段")
+        // 真机若仍偶发,这条日志能抓到模型当时的原始输出,便于定位是截断还是格式漂移。
+        #if DEBUG
+        print("[DiaryAssistService] 解析失败,原始输出 = \(lastRaw)")
+        #endif
+        throw parsedButEmpty ? AssistError.empty : AssistError.parseFailed("非 JSON 输出")
+    }
+
+    /// 从模型原始输出解析追问数组。容错链(对齐 §3.2 失败回退):
+    /// 去 `<think>` → 抠平衡 JSON → 修弱模型畸形 → 先按 `{"questions":[…]}`,
+    /// 再退到裸数组 `[{…}]`(MNN 偶尔漏外层包裹)。彻底解析不出返回 nil(调用方据此重试/报错)。
+    /// 解析成功但无可用问题返回 `[]`(与 nil 区分:调用方报 .empty 而非 .parseFailed)。
+    static func parseQuestions(from raw: String) -> [Question]? {
+        let stripped = HealthExportService.stripThinkBlocks(raw)
+
+        var rawQuestions: [[String: Any]]?
+        // ① 标准结构 {"questions":[…]}
+        let objStr = CaptureService.repairJSON(CaptureService.extractJSONObject(from: stripped))
+        if let data = objStr.data(using: .utf8),
+           let dict = (try? JSONSerialization.jsonObject(with: data)) as? [String: Any],
+           let arr = dict["questions"] as? [[String: Any]] {
+            rawQuestions = arr
         }
-        let questions = rawQuestions.compactMap { d -> Question? in
+        // ② 退路:模型漏了外层包裹,直接吐 [{…},{…}]
+        if rawQuestions == nil {
+            let arrStr = CaptureService.repairJSON(CaptureService.extractBalancedJSON(from: stripped))
+            if let data = arrStr.data(using: .utf8),
+               let arr = (try? JSONSerialization.jsonObject(with: data)) as? [[String: Any]] {
+                rawQuestions = arr
+            }
+        }
+        guard let rawQuestions else { return nil }
+
+        return rawQuestions.compactMap { d -> Question? in
             guard let q = (d["q"] as? String)?
                     .trimmingCharacters(in: .whitespacesAndNewlines), !q.isEmpty else {
                 return nil
@@ -95,8 +129,6 @@ struct DiaryAssistService {
                 .trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
             return Question(q: q, fill: fill, dim: dim)
         }
-        guard !questions.isEmpty else { throw AssistError.empty }
-        return (Array(questions.prefix(4)), lastRate)
     }
 
     /// 把语音转写稿整理成健康日记草稿(spec 2026-06-10-voice-diary)。