feat(installer): remove Startup worker shortcut on uninstall

src/ClaudeDo.Installer/Core/UninstallRunner.cs

@@ -58,6 +58,7 @@ public sealed class UninstallRunner
         TryDeleteFile(Path.Combine(
             Environment.GetFolderPath(Environment.SpecialFolder.CommonStartMenu),
             "Programs", "ClaudeDo.lnk"));
+        TryDeleteFile(AutostartShortcut.PathIn(AutostartShortcut.DefaultStartupDir));
 
         // 5) Delete install directory. Track success so we can report partial state.
         var failures = new List<string>();