refactor(client-ui-plugin-config): stage card edits behind an explicit save

Controls committed on blur, which turned leaving a field into a durable,
revision-fenced document write the user could neither preview nor undo, and
silently discarded a draft the field did not accept.

A card's form now owns the staged text every control renders, and Save is the
only point where drafts become writes. Reset stages the composed default the
same way; an invalid draft blocks the save with its reason instead of being
dropped; Discard drops the drafts; a collapsed card marks that it holds some.
The Host stays the only authority on whether a value was accepted, so the save
reads the section back and keeps the drafts of a save that did not land.

.agents/notes/implemented/feature/2026-08-10-web-plugin-configuration.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-08-10-web-plugin-configuration.md
-2026-08-10-web-plugin-configuration.md: 146dac0684a783b170614c3320485dd8f2127a66
-2026-08-10-web-plugin-configuration.zh.md: b0a1b1b91fc5a1bc0e3162c3e72d28ea057d44da
+2026-08-10-web-plugin-configuration.md: cfc7108d3f241ba91c102e32f58b0b4fc2966f0c
+2026-08-10-web-plugin-configuration.zh.md: cb6c5e0903a2f3034ff365fc50dd78e4fb655a06

.agents/notes/implemented/feature/2026-08-10-web-plugin-configuration.md

@@ -26,6 +26,8 @@ Three host-plane plugins register their own settings namespace, and one browser-
 
 **The section knows no namespace.** `dsh-client-ui-plugin-config` declares a `settings.plugin.item` slot and renders the cards registered into it, so a plugin that ships a browser half owns its card and its controls. Each card binds its namespace through the client settings scope, which gained the two things a form needs: the raw `user` layer, whose key PRESENCE is what marks a field overridden, and `unset`, which clears one field back to the composition layer. A card renders nothing while its namespace is unavailable, so a deployment that does not compose the owning plugin shows no trace of it.
 
+**A card stages its edits and writes them on save.** Controls hold no draft of their own: the card's form owns the staged text, every control renders it, and only **Save** turns it into document mutations. A settings write is durable and revision-fenced, so a control that committed as it settled spent a revision on a value the user had not decided to store and could not preview; the reset stages the composed default the same way. Because the Host's validators own the constraints no schema can express, the form reads the section back after writing and reports a save that did not land instead of predicting the outcome, keeping those drafts for the user to correct. The credential control is staged with the rest even though it writes through the credentials domain, so one save covers everything the card shows.
+
 ## Alternatives considered
 
 - **A registration-time exposure declaration replacing the allowlist.** The honest shape — the namespace's owner declares its own exposure, and a plugin distributed outside this repository can surface its configuration without a change in `packages/host/apiproxy`. Deferred because it changes the seam contract, every existing registration site, and the anti-enumeration semantics at once, and because a plugin exposing an arbitrary schema needs a fail-closed redaction path first: a secret reachable only through a union or transform is currently returned verbatim.
@@ -33,6 +35,8 @@ Three host-plane plugins register their own settings namespace, and one browser-
 - **Editing preset-mounted plugins from this page.** Out of scope, and not merely unbuilt: a preset's rows carry their configuration inline in `agent.cordis.yml` and cannot register a settings namespace at all, because a second session mounting the same preset would fail on a duplicate registration. A user layer shared across presets would also overwrite the fields a preset uses to define its agent's identity — its persona text, its delegation wiring — which are per-preset by design.
 - **One namespace per executor package instead of the capability-named `bash`.** Declined because the composed executor differs by platform while the settings document does not: a user who set a timeout on macOS would silently lose it on Windows.
 - **Writing the search key into the settings section.** Declined because the literal would then have to ride a `describe` response to be rendered. The card reports only whether a key is configured and writes through the credentials domain, addressed by the reference the section names.
+- **Committing each control as it settles, with no save.** Built first, and replaced: blur is not a decision. It spent a namespace revision per control, gave the user nothing to preview or undo before the write, and left an invalid draft silently discarded — a value the Host's validator refuses simply snapped back with no reason given. One save per card makes the write a gesture the user performs.
+- **Validating the fields in the browser to keep the save honest.** Declined: the constraints live in the owning plugin's section validator, and restating them here would make two homes for one rule that could disagree per release. The card checks only what its own control can decide — that a numeric draft is a number — and lets the Host answer for the rest, which is why the save reads the section back.
 
 ## Consequences
 

.agents/notes/implemented/feature/2026-08-10-web-plugin-configuration.zh.md

@@ -26,6 +26,8 @@ Status: implemented
 
 **该分区不认识任何命名空间。** `dsh-client-ui-plugin-config` 声明 `settings.plugin.item` slot 并渲染注册进来的卡片，因此带浏览器半侧的插件拥有自己的卡片与控件。每张卡片通过客户端 settings scope 绑定其命名空间，而该 scope 补上了表单所需的两样东西：原始 `user` 层——键的**存在**才标记字段被覆盖——以及把单个字段清回组装层的 `unset`。命名空间不可用时卡片什么都不渲染，因此未组装该插件的部署不会显示它的任何痕迹。
 
+**卡片暂存修改，保存时才写入。** 控件不持有自己的草稿：暂存文本归卡片的表单所有，所有控件渲染的都是它，只有**保存**才把它变成文档变更。settings 写入是持久且带 revision 栅栏的，因此「失焦即提交」的控件会为用户尚未决定存储、也无从预览的值花掉一个 revision；重置同样只是暂存组装默认值。schema 表达不了的约束归 Host 的校验器所有，所以表单在写入后回读分节、报告没有落盘的保存，而不是自行预测结果，并保留这些草稿供用户修改。密钥控件虽然经由 credentials 领域写入，也和其余字段一起暂存，因此一次保存覆盖卡片上的全部内容。
+
 ## 备选方案
 
 - **用注册期的暴露声明取代白名单。** 这才是诚实的形状——命名空间的拥有方声明自己的暴露，在本仓库之外分发的插件也无需改动 `packages/host/apiproxy` 就能呈现自己的配置。之所以暂缓，是因为它会同时改变 seam 契约、全部现有注册点与防枚举语义；而且插件要暴露任意 schema，还得先有 fail-closed 的脱敏路径：目前只能经由 union 或 transform 抵达的 secret 会被原样返回。
@@ -33,6 +35,8 @@ Status: implemented
 - **在本页编辑 preset 挂载的插件。** 超出范围，而且不只是「尚未实现」：preset 的行把配置内联在 `agent.cordis.yml` 中，且根本无法注册 settings 命名空间——同一 preset 挂载第二个会话时会因重复注册而失败。跨 preset 共享的用户层还会覆盖 preset 用来定义其 agent 身份的字段——人设文本、委派接线——而这些字段按设计就是各 preset 各自的。
 - **按执行器包各取一个命名空间，而非按能力命名的 `bash`。** 否决，因为被组装的执行器随平台不同，而设置文档不随平台不同：在 macOS 上设过超时的用户，到 Windows 上会悄无声息地失去它。
 - **把搜索密钥写进 settings 分节。** 否决，因为那样字面值就必须搭乘 `describe` 响应才能被渲染。卡片只报告是否已配置密钥，并按分节所命名的引用经由 credentials 领域写入。
+- **每个控件失焦即提交，不设保存。** 最初就是这么做的，后被替换：失焦不是决定。它每个控件花掉一个命名空间 revision，写入前不给用户任何预览或撤销的余地，还会把无效草稿悄悄丢弃——被 Host 校验器拒绝的值只是弹回原样，不给任何理由。每张卡片一个保存，才让写入成为用户执行的动作。
+- **在浏览器端校验字段，好让保存诚实。** 否决：这些约束住在拥有方插件的分节校验器里，在这里重述一遍就会让同一条规则有两个家，且可能随版本各说各话。卡片只判断自己的控件能判断的事——数字草稿是不是数字——其余交给 Host 回答，这正是保存要回读分节的原因。
 
 ## 影响