feat: open local runtime clients from the composer

Add composer shortcuts for local Continue and OpenCode terminals and the official DeepSeek Harness Web client, using the current project and model bridge. Manage browser service reuse, stop actions and terminal cleanup. Upgrade DeepSeek Harness to 0.1.7-rc.2 and Cordis to 4.0.4.

Include the coordinated IPC handler extraction and related tests and documentation. Remote native-client coordinator wiring, managed Node consolidation, Ask MCP mappings and full desktop/package acceptance remain unfinished; this commit records the implemented local workflow and supporting SSH groundwork.

Validation: typecheck and lint passed; 267 focused tests passed and 5 skipped. No new real-provider calls were made for this commit. Prior real-model evidence and remaining acceptance work are documented in the feature progress files.

Release note: 本地项目选择 Continue 或 OpenCode 后，可从输入框下方打开原生终端；选择 DS 后，可打开使用当前项目和模型的官方 Web 客户端。客户端使用独立会话，DS 网页关闭后服务继续运行，可在 GoodBuddy 中停止；远程入口尚未完成。

docs/features/local-tool-environment/README.md

@@ -8,8 +8,17 @@ stdio MCP 提供明确、可诊断的 Node.js 与 Python 环境，同时允许
 用户从设置中心的“能力与工具”进入，并在 `Skills`、`MCP`、`工具执行环境` 三个水平
 Tab 之间切换。
 
+[Obsidian 接入](../obsidian/README.md)复用本功能的 `LaunchEnvironmentProvider` 启动
+随包交付的 MCPVault，不新增 Node 安装或下载源设置。生产组件自动化已覆盖真实 MCPVault
+调用，Electron 托管 Node 离线冒烟仍待完成，具体见[验证记录](../obsidian/progress.md)。
+
 ## 文档导航
 
+Local native Continue and DS Web clients now honor the current custom Node
+selection. They require standard Node rather than Electron's Node mode; the
+remaining managed fallback and validation are tracked in
+[native client progress](../assistant-workbar/progress.md#2026-09-27-local-native-client-validation).
+
 | 文档 | 权威职责 |
 | --- | --- |
 | [PRD](./prd.md) | 用户问题、产品目标、范围、需求和产品验收 |