refactor: streamline the course to 17 lessons

s09_memory/images/memory-subsystems.svg

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-  <text x="360" y="25" fill="#fff" font-size="14" font-weight="700" text-anchor="middle">Memory System — 存储 · 加载 · 提取 · 整理</text>
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-  <!-- 加载 -->
+  <!-- 召回 -->
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-  <text x="322" y="80" fill="#5b21b6" font-size="13" font-weight="700" text-anchor="middle">加载</text>
+  <text x="322" y="80" fill="#5b21b6" font-size="13" font-weight="700" text-anchor="middle">召回</text>
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-  <text x="237" y="108" fill="#5b21b6" font-size="10">索引常驻 SYSTEM</text>
-  <text x="237" y="124" fill="#5b21b6" font-size="10">LLM side-query 选文件</text>
+  <text x="237" y="108" fill="#5b21b6" font-size="10">索引加入 system prompt</text>
+  <text x="237" y="124" fill="#5b21b6" font-size="10">模型选择相关文件</text>
   <text x="237" y="134" fill="#a78bfa" font-size="9">≤ 5 条，失败降级到关键词</text>
 
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   <text x="522" y="80" fill="#5b21b6" font-size="13" font-weight="700" text-anchor="middle">提取</text>
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-  <text x="472" y="108" fill="#5b21b6" font-size="10">每轮结束后触发</text>
-  <text x="472" y="124" fill="#5b21b6" font-size="10">LLM 提取偏好/约束</text>
-  <text x="472" y="134" fill="#a78bfa" font-size="9">检查已有，避免重复</text>
+  <text x="472" y="108" fill="#5b21b6" font-size="10">回合结束后触发</text>
+  <text x="472" y="124" fill="#5b21b6" font-size="10">模型提取持久知识</text>
+  <text x="472" y="134" fill="#a78bfa" font-size="9">scope + 重复检查</text>
 
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@@ -46,7 +46,7 @@
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   <text x="615" y="108" fill="#5b21b6" font-size="10">文件 ≥ 10 触发</text>
   <text x="615" y="124" fill="#5b21b6" font-size="10">去重·合并·剪枝</text>
-  <text x="615" y="134" fill="#a78bfa" font-size="9">CC: 三层门控</text>
+  <text x="615" y="134" fill="#a78bfa" font-size="9">快照 + 失败恢复</text>
 
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@@ -69,10 +69,4 @@
   <text x="60" y="260" fill="#5b21b6" font-size="10" font-weight="600">四类记忆：</text>
   <text x="140" y="260" fill="#475569" font-size="10">user（你是谁）· feedback（怎么做事）· project（正在发生什么）· reference（东西在哪找）</text>
 
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-  <text x="60" y="316" fill="#5b21b6" font-size="11" font-weight="600">CC 源码对照</text>
-  <text x="60" y="334" fill="#475569" font-size="10">• 记忆选择：LLM side-query（Sonnet 选），不是 embedding 向量相似度</text>
-  <text x="60" y="350" fill="#475569" font-size="10">• 提取时机：每轮结束时由 stop hook 触发，与 compact_history 分开执行</text>
-  <text x="60" y="366" fill="#475569" font-size="10">• Dream 整理：三层门控（时间 ≥ 24h + 会话 ≥ 5 + 文件锁），不是简单计数</text>
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