feat(web): pick a session's agent preset from the composer
A seat in the composer tool row, left of the model select, showing the preset THIS session runs — its own recorded one, not the deployment default, because a resumed session runs what it was created with. `SessionSummary` carries `agentPreset` for that, alongside `cwd` and `origin`. The switch exists only while the conversation has not started. After the first turn the seat becomes a plain label rather than a disabled menu: a greyed control reads as "temporarily unavailable", when in fact the choice is gone for good. The seat never asks in that state, and the host refuses independently with `agent-preset-locked`, so a stale client cannot slip one past it. A rejected switch restores the previous value and surfaces the host's message rather than leaving the seat showing something the session is not running.
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@@ -8,6 +8,12 @@ agent preset 表层:General 设置中的一行,用于选择新建会话据
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会话的 preset 在创建时即固定——宿主拒绝以不同 preset 接管已存在的会话,因为该会话的历史是在最初那份 preset 的工具下产生的。因此本行不可能是实时切换,它也如实说明了这一点:更改只对此后开启的会话生效,而运行中的会话保持它们开始时的组装。
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## composer 座位
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第二个表层,位于 composer 工具行、模型选择器左侧:**本会话**所运行的 preset。它显示会话自身记录的 preset 而非部署默认值,因为被恢复的会话运行的是它创建时的那一份。
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切换只在对话尚未开始时存在。第一个轮次之后,该座位变为纯文本标签——展示一个禁用的菜单会让人以为这个选择只是暂时不可用,而非已经消失。宿主执行同一条规则并返回 `agent-preset-locked`,因此过期的客户端无法绕过它。
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## 它读什么、写什么
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选项与当前默认值都来自同一次 `agentPreset.list` 调用。名单本身已经报告了"未显式选择的会话会得到哪个 id",因此本行无需对 settings schema 做内省;写入目标是 `agent-presets` settings 命名空间的 `default` 字段,也正是宿主在创建时解析的那个字段。
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@@ -30,6 +36,5 @@ Indirectly, through the preset a later session is composed from; [`dsh-agent-pre
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## Known Limitations and Deferred Work
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- **创建时无法逐会话选择** —— 本行只设置默认值。wire 上 `session.create` 已经携带 `agentPreset`,因此会话开启表层可以提供该选择;该表层尚不存在。
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- **preset 按 id 列出** —— preset 不携带展示用元数据,因此菜单显示的是目录名。
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- **不提供创作能力** —— 创建、编辑或删除 preset 是文件系统行为;本表层只在名单提供的范围内做选择。
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