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/magic-notes/technical-design.md

@@ -1,5 +1,23 @@
 # Magic Notes Technical Design
 
+## Main IPC Ownership
+
+[magic-notes-ipc.ts](../../../src/main/magic-notes/magic-notes-ipc.ts) owns
+note search/list/get/create/update/delete, entry create/update/delete and todo
+list/status/update handlers, including conversation-source validation and entry
+content mapping. Its two registration functions receive the existing tracked
+`registerHandler`, window and database from [ipc.ts](../../../src/main/ipc.ts),
+preserving registration order: note CRUD, entry/draft analysis, todo CRUD, then
+todo analysis. [magic-notes-analysis-ipc.ts](../../../src/main/magic-notes/magic-notes-analysis-ipc.ts)
+owns the three analysis handlers through two registration functions. It receives
+the window, database, settings readers, usage persistence callback and existing
+error formatter; it imports `createDefaultModelRuntime` directly. `ipc.ts` retains
+tracked registration/removal and shared usage persistence.
+Sender checks and shared input schemas stay at each handler boundary.
+[rich-content.ts](../../../src/main/magic-notes/rich-content.ts) remains shared
+by CRUD and draft analysis. Analysis retains revision checks, hidden task status,
+stream events, error causes and nested release/dispose cleanup.
+
 ## Continuous Record Workspace
 
 The detail mounts every entry in a continuous newest-first stream. The left index
@@ -252,7 +270,13 @@ Draft, saved-entry and todo analysis use the existing typed preload/IPC methods
 and `createDefaultModelRuntime`. Each canvas request reads the current default
 model profile's `supportsImageInput` (or the resolved default setting when no
 profile is selected). Main resolves settings again for the actual request. This
-does not change an Agent runtime or desktop-to-Agent protocol.
+does not change an Agent runtime or desktop-to-Agent protocol. All three handlers
+read global resolved settings per request, without applying chat/project runtime
+selection. The factory creates a tool-free direct `ModelAgentRuntime`, using the
+resolved default model connection and that profile's headers, body options and
+output limit. Environment-managed default credentials retain the settings store's
+environment overrides. The existing context-compression configuration can select
+a separate summary model; it does not select the main analysis model.
 
 `magicNoteCanvasPageCount` is an application preference: an integer from 1 to 8,
 defaulting to 1 when absent in historical settings. The application center and