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    <title>封仁华的工程笔记</title>
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    <description>把做过的事写清楚：问题、数据、复盘。</description>
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      <title>三层埋点：如何确认模型真正收到了什么</title>
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      <pubDate>Thu, 05 Nov 2026 00:00:00 +0000</pubDate>
      <description>一次失败的排查让我明白：观测点放错位置，看到的都是别人的转述。</description>
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      <title>六层记忆：在有限上下文里保留最有用的信息</title>
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      <pubDate>Thu, 05 Nov 2026 00:00:00 +0000</pubDate>
      <description>上下文只有那么大，而对话会一直增长。分层不是复杂度，是取舍。</description>
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    <item>
      <title>把大模型前缀缓存命中率从 58% 提升到 93%</title>
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      <pubDate>Wed, 04 Nov 2026 00:00:00 +0000</pubDate>
      <description>一次完整的问题定位：两次误判、三层埋点，最后发现根因只有一行配置。</description>
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