Merge remote-tracking branch 'origin/master' into worktree/worktree-local-lefthook-20260727

.agents/notes/implemented/feature/2026-07-27-native-workspace-directory-picker.i18n.yaml

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+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# 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/2026-07-27-native-workspace-directory-picker.md
+2026-07-27-native-workspace-directory-picker.md: 847b7a7c7844a47e534183008acfdc32e2e08125
+2026-07-27-native-workspace-directory-picker.zh.md: e484a2ba5860d43925aba82be31c803716a33bc5

.agents/notes/implemented/feature/2026-07-27-native-workspace-directory-picker.md

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+# Agent Note: Native workspace directory picker
+
+Status: implemented
+
+English | [中文](2026-07-27-native-workspace-directory-picker.zh.md)
+
+## Problem
+
+The desktop GUI asks users to type an absolute path when they add an existing workspace. This is slower and more error-prone than choosing a directory with the operating system's native picker. The GUI is delivered through the local Web carrier, so opening a native dialog also creates a privileged boundary that ordinary remote requests must not cross.
+
+## Decision
+
+Add a single-folder `host.pickDirectory` RPC and expose it through `WorkspacesService`. The workspace menu presents two flat actions: **Open local folder...** and **Create a new workspace**. Selecting a folder reuses the existing `workspace.create({ path })` flow, selects the returned workspace, and starts a blank session.
+
+The workspace manager must upsert the returned workspace before the selection callback runs. A newly adopted directory therefore renders its basename immediately. Reopening an already registered path preserves its existing workspace title.
+
+## Interaction contract
+
+- The picker accepts one directory on macOS, Windows, and Linux.
+- Cancelling the system dialog is silent and returns `null`.
+- A duplicate path selects the existing workspace.
+- A different path whose derived title conflicts with another workspace shows a focused error with **Choose again** and **Cancel** actions.
+- Other picker failures show a compact retryable error.
+- The existing create-by-name flow remains unchanged.
+
+## Host boundary
+
+The native dialog RPC is accepted only from a loopback socket with same-origin browser metadata. The RPC does not use the default 30-second request timeout because a system dialog may remain open indefinitely; caller and connection aborts still propagate to the platform process.
+
+Platform adapters invoke native tools without a shell:
+
+- macOS: `osascript` and the system folder chooser.
+- Windows: PowerShell in STA mode and `FolderBrowserDialog`.
+- Linux: `zenity`, with `kdialog` as a fallback when Zenity is unavailable.
+
+## Alternatives considered
+
+- A custom directory browser duplicates operating-system behavior and permissions, and belongs to the Web implementation rather than this desktop-only change.
+- Reusing the manual path field keeps the current error-prone interaction.
+- Adding authentication infrastructure for one local native dialog would expand the change beyond its threat model; loopback and same-origin checks are sufficient for this carrier.
+
+## Consequences
+
+The current GUI opens one local folder through a native picker on macOS, Windows, and Linux. Cancelling changes no state, failures remain retryable, and duplicate paths are idempotent while title conflicts require an explicit new choice. The selected workspace and its displayed name refresh before a new blank session starts. Existing workspace creation by name remains available.
+
+The added host, runtime, component, and GUI tests cover the native boundary, request trust checks, cancellation and failure handling, existing-path reuse, title conflicts, and the immediate visible-name update. The privileged RPC remains specific to the local desktop carrier; a remote Web directory browser is outside this decision.
+
+## Risks
+
+- Linux desktop environments may provide neither supported picker. The GUI reports that limitation instead of falling back to a typed path.
+- Browser metadata varies outside the supported local carrier. The endpoint intentionally rejects requests that cannot prove the required local same-origin context.

.agents/notes/implemented/feature/2026-07-27-native-workspace-directory-picker.zh.md

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+# Agent Note: 原生工作区目录选择器
+
+Status: implemented
+
+[English](2026-07-27-native-workspace-directory-picker.md) | 中文
+
+## 问题
+
+桌面端 GUI 在添加现有工作区时要求用户输入绝对路径。相比使用操作系统原生选择器选取目录，这种操作速度更慢，也更容易出错。GUI 由本地 Web 载体提供，因此打开原生对话框也会形成一条特权边界，普通远程请求不得越过这条边界。
+
+## 决策
+
+新增一个用于选择单个文件夹的 `host.pickDirectory` RPC，并通过 `WorkspacesService` 暴露该 RPC。工作区菜单提供两个平铺操作：**打开本地文件夹…** 和 **创建新工作区**。选定文件夹后，系统复用现有的 `workspace.create({ path })` 流程，选中返回的工作区，并启动一个空白会话。
+
+工作区管理器必须在选择回调运行前插入或更新返回的工作区。因此，新纳入的目录会立即显示其 basename。再次打开已注册的路径时，则保留该工作区现有的标题。
+
+## 交互契约
+
+- 在 macOS、Windows 和 Linux 上，选择器一次只允许选择一个目录。
+- 取消系统对话框不会显示提示，并返回 `null`。
+- 路径重复时，选中现有工作区。
+- 如果路径不同，但其派生标题与另一个工作区冲突，则显示明确指出该冲突的错误提示，其中包含 **重新选择** 和 **取消** 操作。
+- 选择器的其他故障会显示简洁且可重试的错误提示。
+- 现有的按名称创建流程保持不变。
+
+## 宿主边界
+
+只有来自回环套接字、且携带同源浏览器元数据的请求才能调用原生对话框 RPC。该 RPC 不使用默认的 30 秒请求超时，因为系统对话框可能无限期保持打开；调用方中止或连接中止仍会传递至平台进程。
+
+平台适配器不经 shell，直接调用原生工具：
+
+- macOS：`osascript` 和系统文件夹选择器。
+- Windows：采用 STA 模式的 PowerShell 和 `FolderBrowserDialog`。
+- Linux：使用 `zenity`；Zenity 不可用时回退到 `kdialog`。
+
+## 考虑过的替代方案
+
+- 自定义目录浏览器会重复实现操作系统的行为和权限逻辑，而且应属于 Web 实现，而非本次仅面向桌面端的变更。
+- 继续使用手动路径字段会保留当前容易出错的交互方式。
+- 为一个本地原生对话框添加身份认证基础设施，会使变更范围超出其威胁模型；对当前载体而言，回环与同源检查已经足够。
+
+## 后果
+
+当前 GUI 可以在 macOS、Windows 和 Linux 上通过原生选择器打开一个本地文件夹。取消操作不会改变任何状态，故障仍可重试；重复路径的处理具有幂等性，标题冲突则要求用户明确重新选择。选中的工作区及其显示名称会在启动新的空白会话前完成刷新。现有的按名称创建工作区功能仍可使用。
+
+新增的宿主、运行时、组件和 GUI 测试覆盖原生边界、请求信任校验、取消与故障处理、已有路径复用、标题冲突和可见名称即时更新。该特权 RPC 仍仅面向本地桌面载体；远程 Web 目录浏览器不属于本次决策范围。
+
+## 风险
+
+- Linux 桌面环境可能不提供任何一种受支持的选择器。GUI 会报告这项限制，而不会回退到要求用户输入路径。
+- 在受支持的本地载体之外，浏览器元数据可能有所不同。对于无法证明其满足所需本地同源上下文的请求，该端点会按设计拒绝。