docs(readme): cite the alpha.2 adaptation PR in the changelog

README.md

@@ -268,7 +268,7 @@ GitHub topic [`dsh-better-sidebar`](https://github.com/topics/dsh-better-sidebar
 
 **✨ 新功能**
 
-- 🪟 **每个 tab 体都填满面板**：原生右侧栏的 tab 体宿主是「有确定高度的块级滚动容器」而非 flex 容器，此前插件各 tab 的根只写 `flex: 1`，在块容器里塌成内容高度——侧边对话的输入框因此贴不到面板底（转录一长就被推出可视区）。现在 native 适配层统一给每个 tab 体包一层 `height: 100%` 的列 flex 宿主，插件全部 tab（含第三方 `registerTab` 注册的 descriptor）恢复与底部工作台一致的填满语义。
+- 🪟 **每个 tab 体都填满面板**（#609）：原生右侧栏的 tab 体宿主是「有确定高度的块级滚动容器」而非 flex 容器，此前插件各 tab 的根只写 `flex: 1`，在块容器里塌成内容高度——侧边对话的输入框因此贴不到面板底（转录一长就被推出可视区）。现在 native 适配层统一给每个 tab 体包一层 `height: 100%` 的列 flex 宿主，插件全部 tab（含第三方 `registerTab` 注册的 descriptor）恢复与底部工作台一致的填满语义。
 
 **🐛 修复**
 
@@ -277,7 +277,7 @@ GitHub topic [`dsh-better-sidebar`](https://github.com/topics/dsh-better-sidebar
 
 **🧰 CI 与内部**
 
-- 基线推进到 DSH 0.1.5-alpha.2：peer 下限、22 个 devDependency 钉版、CI 挂载车道与 `dsh.plugin.json` engines 同步；`pnpm peers check` 干净（按 §3-9 补提 `dsh-session-persistence` 传递 peer）。
+- 基线推进到 DSH 0.1.5-alpha.2（#609）：peer 下限、22 个 devDependency 钉版、CI 挂载车道与 `dsh.plugin.json` engines 同步；`pnpm peers check` 干净（按 §3-9 补提 `dsh-session-persistence` 传递 peer）。
 - **移除 `TabDescriptor.description`**：alpha.2 的原生指南条目不再渲染第二行（改为「图标+标题」胶囊），该字段与 6 个 `guideDesc*` 词条（20 份词典）一并下线；新建标签页的默认页改由注册表选（恰好 1 个指南条目则直接打开它）。
 
 ### v0.19.0-alpha.0

README_EN.md

@@ -272,7 +272,7 @@ The GitHub topic [`dsh-better-sidebar`](https://github.com/topics/dsh-better-sid
 
 **✨ New**
 
-- 🪟 **Every tab body now fills its pane**: the native sidebar's tab-body host is a block scroller with a definite height, not a flex container, and the plugin's tab roots declared only `flex: 1` — so they collapsed to content height and the side-chat composer sat right after the transcript instead of at the pane bottom (a long transcript pushed it out of view). The native adapter now wraps every tab body in a `height: 100%` column flex host, restoring the same fill semantics the bottom workbench has for all plugin tabs, third-party `registerTab` descriptors included.
+- 🪟 **Every tab body now fills its pane** (#609): the native sidebar's tab-body host is a block scroller with a definite height, not a flex container, and the plugin's tab roots declared only `flex: 1` — so they collapsed to content height and the side-chat composer sat right after the transcript instead of at the pane bottom (a long transcript pushed it out of view). The native adapter now wraps every tab body in a `height: 100%` column flex host, restoring the same fill semantics the bottom workbench has for all plugin tabs, third-party `registerTab` descriptors included.
 
 **🐛 Fixes**
 
@@ -281,7 +281,7 @@ The GitHub topic [`dsh-better-sidebar`](https://github.com/topics/dsh-better-sid
 
 **🧰 CI & internals**
 
-- Baseline moved to DSH 0.1.5-alpha.2: peer floor, 22 devDependency pins, the CI mount lane, and `dsh.plugin.json` engines all follow; `pnpm peers check` is clean (hoisted the `dsh-session-persistence` transitive peer per §3-9).
+- Baseline moved to DSH 0.1.5-alpha.2 (#609): peer floor, 22 devDependency pins, the CI mount lane, and `dsh.plugin.json` engines all follow; `pnpm peers check` is clean (hoisted the `dsh-session-persistence` transitive peer per §3-9).
 - **`TabDescriptor.description` removed**: alpha.2's native guide entries no longer render a second line (they are icon + title capsules), so the field and the six `guideDesc*` keys (20 dictionaries) are gone; a new pane's default page is now selected from the registry (exactly one guide entry opens that page directly).
 
 ### v0.19.0-alpha.0