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仅当 DeskBox.exe 位于本地 git 克隆内（向上找到同时含 .git 与 scripts/fork-dev-update.ps1 的仓库根）时启用，正式安装版完全不受影响。 - Directory.Build.targets：Debug 构建时 git rev-parse，把提交 sha/分支写入 AssemblyMetadata（ForkGitSha/ForkGitBranch）；取不到时运行时读 .git。 - 启动后及每 30 分钟匿名请求 GitHub commits/dev，比较远端最新 sha， 有新提交时发更新通知（沿用现有更新提示样式，点击打开 关于）。 - 设置「关于→更新详情」显示「本地测试版：当前 <短sha>，有新提交 …」与 「更新并重启」按钮；点「检查更新」时同时检查该通道。 - 「更新并重启」以独立可见窗口运行 fork-dev-update.ps1 后退出 DeskBox； 脚本新增 -GraceSeconds（先等 DeskBox 自行退出），失败时 Read-Host 暂停。 - 新增 ForkDevUpdateTests：仓库根探测、sha 比较、正式安装版不启用等。
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做了什么
本地开发构建（DeskBox.exe 位于含
.git与scripts/fork-dev-update.ps1的克隆内）启用「本地测试版更新通道」；正式安装版完全不受影响（探测不到仓库根即全部关闭）。Directory.Build.targets在 Debug 构建时执行git rev-parse，写入AssemblyMetadata（ForkGitSha/ForkGitBranch）。git 不可用时不报错，运行时改读.git（HEAD → loose ref / packed-refs / worktree）。Release / CI / 安装包构建不执行（可用/p:ForkEmbedGitInfo=true强开）。GET https://api.github.com/repos/GOXF/DeskBox/commits/dev，失败静默。有新提交时发更新通知（沿用现有更新 toast，托盘气泡兜底；遵循「显示更新通知」开关；同一提交只提示一次），点击打开 设置→关于。powershell -ExecutionPolicy Bypass -File <repo>\scripts\fork-dev-update.ps1 -Branch dev -GraceSeconds 15，再走现有ShutdownForUpdateAsync退出 DeskBox。-GraceSeconds（先等 DeskBox 自行退出再强制结束）；git fetch/checkout 检查退出码；任何失败时窗口暂停（Read-Host）。文件
新增：
Services/ForkDevBuildInfo.cs、Services/ForkDevUpdateService.cs、ViewModels/SettingsViewModel.ForkDevUpdate.cs、Views/SettingsWindow.ForkDevUpdate.cs、App.ForkDevUpdate.cs、tests/.../ForkDevUpdateTests.cs改动（最小）：
App.xaml.cs+1 行、SettingsViewModel.AboutAndUpdates.cs+1 行、SettingsWindow.xaml+17 行、Directory.Build.targets、scripts/fork-dev-update.ps1测试
ForkDevUpdateTests：仓库根探测（嵌套 bin、worktree .git 文件、缺 .git / 缺脚本）、正式安装目录不启用、.git 读 sha（loose / packed / detached）、sha 比较、commits API 解析、网络失败静默、脚本启动参数。