feat(polish): add question guard, ABE routing, and flow trace

Harden polish so question drafts stay questions, add local density
routing with style-specific degrade, expand fun style packs, and add
end-to-end FlowTrace logging plus offline guard eval scripts.

CHANGELOG.md

@@ -15,10 +15,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Delete day in History**: each day header has a Delete action with confirmation to clear that day's transcripts only (iOS and Mac). / **历史按天删除**：日期行右侧提供删除按钮，确认后仅清除当天记录（iOS 与 Mac）。
 - **Mac Settings translation target**: polish-provider section includes “Polish then translate” with the same locale picker as Home / menu bar. / **Mac 设置翻译目标**：润色（LLM）分区新增「润色后翻译」，与首页 / 菜单栏同一套目标语言选择。
 
+### Fixed
+- **Polish never answers the transcript**: fun styles (dating / flex / corp) could turn “你觉得这个包怎么样” into a reply such as “还行，挺顺眼的”. A top-priority “polish only, never answer” rule now sits in the global contract, every built-in style pack, the prompt safety boundary, and a router question guard that keeps question drafts as questions. / **润色不再代答转写内容**：趣味风格（直男癌/装逼指南/大厂黑话）曾把「你觉得这个包怎么样」润色成「还行，挺顺眼的」。现已在全局契约、全部内置风格包、提示词安全边界与路由问句守卫四层加入最高优先级的「只润色、不作答」规则，问句必须仍是问句。
+
 ### Changed
 - **Two-tier short polish skip**: ultra-short (≤4 CJK) still skips the LLM; 5–10 CJK now skips only low-value acks/closings (e.g. “好的我知道了”), while questions and contentful shorts still polish. / **两级短句跳过润色**：≤4 字仍跳过 LLM；5–10 字仅对低价值确认/收束语跳过（如「好的我知道了」），问句与有内容短句仍走润色。
 - **ABE polish routing**: fun styles and daily chat use a local information-density gate, prompt hard-brakes, and style-specific degrade (e.g. DiBa without an opponent quote falls back to chat cleanup) without a second LLM call. / **ABE 润色路由**：趣味风格与日常聊天增加本地信息密度闸、提示词硬刹车与风格专属降级（如帝吧无对方原话时降级日常清理），不增加第二次 LLM 调用。
 - **Practical polish prompts**: Light Clean / Structured / Formal / Daily Chat share a “transcript-only, not a chatbot” boundary; Structured gains active itemization, light semantic reorder, and paragraphing hard rules inspired by high-readability polish patterns. / **实用润色提示词**：轻度清理 / 清晰结构 / 正式表达 / 日常聊天统一「只整理转写、非聊天助手」边界；清晰结构加强积极分项、轻度语义重排与分段硬规则，提升长口述可读性。
+- **RED Note keeps the draft's audience**: the Xiaohongshu style no longer opens with 姐妹们/集美们 or adds comment CTAs unless the draft already addresses a group, and a positive draft can no longer be rewritten with an 避雷-style hook. / **小红书不再擅自加受众**：除非原文本身在对一群人说话，否则不再添加「姐妹们/集美们」开场与评论区互动话术；正面体验也不会被写成「真诚避雷」式钩子。
+- **Style-specific forbidden-items chapters**: every built-in polish prompt now has a dedicated `# 禁止事项` section modeled on Daily Chat—no interlocutor replies, no answering question drafts—with per-style bans (e.g. dating must not turn asks into verdicts; flex/corp must not answer as the other party; XHS must not invent product claims). / **风格专属禁止事项**：全部内置润色提示词均新增「# 禁止事项」章节，结构对齐日常聊天（禁接话、禁代答问句），并按风格补充专属禁令（如直男癌不得把征求意见改成评价；装逼/黑话不得替对方作答；小红书不得编造功效细节）。
 - **Settings hierarchy**: voice-session options join Daily, while ASR and LLM configuration links sit directly below the transcription-mode choices; General and About remain secondary pages. / **设置层级**：语音会话选项并入「日常」，ASR 与 LLM 配置入口紧跟转写模式选择；通用与关于保留为二级页。
 - **Transcription option rows**: local and cloud choices now use the same text-first list-row style as the rest of Settings, without leading icons. / **转写选项行**：本地与云端选项移除前置图标，统一采用设置页的文字优先列表样式。
 - **Simplified style cards and summaries**: polish-style cards drop decorative badges, and speech-configuration summaries show only the active engine or provider/model without redundant status prefixes. / **简化风格卡与摘要**：润色风格卡移除装饰图标；语音配置摘要仅显示引擎或服务商/模型，不再附加冗余状态前缀。