refactor(ui): remove the stale-worker banner

The banner compared the running worker's build SHA against the
selected list's HEAD via a git ancestor check on every list switch
and reconnect. It added a git-rev-parse MSBuild target, a hub call,
and a poll loop for a corner case that hasn't come up in practice —
not worth the moving parts.

src/ClaudeDo.Ui/Services/Interfaces/IWorkerClient.cs

@@ -183,9 +183,6 @@ public interface IWorkerClient : INotifyPropertyChanged
     Task<string> GetLastPrepLogAsync();
     Task<IReadOnlyList<WorkerLogEntry>> GetRecentLogsAsync();
 
-    /// <summary>Git SHA the running worker was built from (null when offline or the build isn't stamped).</summary>
-    Task<WorkerBuildInfoDto?> GetWorkerBuildInfoAsync();
-
     Task<List<PrimeScheduleDto>> GetPrimeSchedulesAsync();
     Task<PrimeScheduleDto?> UpsertPrimeScheduleAsync(PrimeScheduleDto dto);
     Task DeletePrimeScheduleAsync(Guid id);

src/ClaudeDo.Ui/Services/WorkerClient.cs

@@ -492,9 +492,6 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
     public async Task<string> GetLastPrepLogAsync()
         => await TryInvokeAsync<string>("GetLastPrepLog") ?? string.Empty;
 
-    public Task<WorkerBuildInfoDto?> GetWorkerBuildInfoAsync()
-        => TryInvokeAsync<WorkerBuildInfoDto>("GetWorkerBuildInfo");
-
     public async Task<IReadOnlyList<WorkerLogEntry>> GetRecentLogsAsync()
         => await TryInvokeAsync<List<WorkerLogEntry>>("GetRecentLogs") ?? new List<WorkerLogEntry>();
 

src/ClaudeDo.Ui/ViewModels/IslandsShellViewModel.cs

@@ -5,7 +5,6 @@ using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using ClaudeDo.Data;
-using ClaudeDo.Data.Git;
 using ClaudeDo.Data.Models;
 using ClaudeDo.Ui.Localization;
 using ClaudeDo.Ui.Services;
@@ -52,7 +51,6 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
     private readonly UpdateCheckService _updateCheck = null!;
     private readonly InstallerLocator _installerLocator = null!;
     private readonly WorkerLocator _workerLocator = null!;
-    private readonly GitService? _git;
     private readonly IDbContextFactory<ClaudeDoDbContext>? _dbFactory;
     private readonly Func<WorktreesOverviewModalViewModel> _worktreesOverviewVmFactory = () => null!;
     private readonly Func<WeeklyReportModalViewModel> _weeklyReportVmFactory = () => null!;
@@ -121,11 +119,6 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
     [ObservableProperty] private string? _updateBannerLatestVersion;
     private bool _bannerDismissedThisSession;
 
-    // Persistent (not auto-clearing) banner: the running worker predates the selected list's
-    // merged HEAD, so "verified" claims made against the current process are stale. ClaudeDo-repo
-    // only — see RefreshStaleWorkerCheckAsync.
-    [ObservableProperty] private bool _isStaleWorkerBannerVisible;
-
     // planningTaskId -> subtaskId, for unit-merge conflicts an MCP session (not the UI) started.
     // Kept as a dictionary so a later conflict on the same planning task updates in place instead
     // of piling up duplicate entries.
@@ -328,8 +321,7 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         Func<MergeModalViewModel> mergeVmFactory,
         Func<RepoImportModalViewModel> repoImportVmFactory,
         MissionControlViewModel missionControl,
-        UsagePillViewModel usagePill,
-        GitService? git = null)
+        UsagePillViewModel usagePill)
     {
         Lists = lists; Tasks = tasks; Details = details; Worker = worker;
         MissionControl = missionControl;
@@ -349,9 +341,7 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         _usageMonitorVmFactory = usageMonitorVmFactory;
         _mergeVmFactory = mergeVmFactory;
         _repoImportVmFactory = repoImportVmFactory;
-        _git = git;
         Lists.SelectionChanged += (_, _) => Tasks.LoadForList(Lists.SelectedList);
-        Lists.SelectionChanged += (_, _) => _ = RefreshStaleWorkerCheckAsync();
         Tasks.SelectionChanged += (_, _) => Details.Bind(Tasks.SelectedTask, Tasks.SelectionSource);
         Tasks.PrepRequested += () => Details.ShowPrep();
         Tasks.PropertyChanged += (_, e) =>
@@ -418,7 +408,6 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         };
         Worker.OperationProgressEvent += OnOperationProgress;
         Worker.WorkerLogReceivedEvent += OnWorkerLogReceived;
-        Worker.ConnectionRestoredEvent += () => _ = RefreshStaleWorkerCheckAsync();
         Worker.PlanningMergeConflictEvent += OnPlanningMergeConflict;
         Worker.PlanningMergeAbortedEvent += OnPlanningMergeAborted;
         Worker.PlanningCompletedEvent += OnPlanningMergeCompleted;
@@ -471,8 +460,6 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         _connectTimer.Dispose();
         _primeStatusTimer.Stop();
         _primeStatusTimer.Dispose();
-        _staleWorkerCts?.Cancel();
-        _staleWorkerCts?.Dispose();
     }
 
     private void RefreshBannerFromStatus()
@@ -492,57 +479,6 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         }
     }
 
-    private CancellationTokenSource? _staleWorkerCts;
-
-    // Re-evaluates the stale-worker banner for the currently selected list. Cheap (one hub call +
-    // up to two git subprocesses) and only ever runs for a git-backed list, so it's fine to fire on
-    // every selection change / reconnect rather than caching.
-    private async Task RefreshStaleWorkerCheckAsync()
-    {
-        _staleWorkerCts?.Cancel();
-        var cts = new CancellationTokenSource();
-        _staleWorkerCts = cts;
-
-        var stale = await ComputeIsStaleWorkerAsync(Lists?.SelectedList?.WorkingDir, cts.Token);
-        if (cts.IsCancellationRequested) return;
-        IsStaleWorkerBannerVisible = stale;
-    }
-
-    private async Task<bool> ComputeIsStaleWorkerAsync(string? workingDir, CancellationToken ct)
-    {
-        if (_git is null || Worker is null || string.IsNullOrWhiteSpace(workingDir)) return false;
-
-        try
-        {
-            var buildInfo = await Worker.GetWorkerBuildInfoAsync();
-            var buildSha = buildInfo?.BuildSha;
-            if (string.IsNullOrWhiteSpace(buildSha)) return false;
-            if (!await _git.IsGitRepoAsync(workingDir, ct)) return false;
-
-            var head = await _git.RevParseHeadAsync(workingDir, ct);
-            var isAncestor = string.Equals(buildSha, head, StringComparison.OrdinalIgnoreCase)
-                ? (bool?)false // equal — never "stale" on a match, and no need to ask git
-                : await _git.IsAncestorAsync(workingDir, buildSha, head, ct);
-            return ShouldShowStaleWorkerBanner(buildSha, head, isAncestor);
-        }
-        catch
-        {
-            // Worker offline, dir no longer a repo, etc. — unknown, so stay quiet.
-            return false;
-        }
-    }
-
-    // Pure decision extracted for testability. isAncestor is the tri-state result of
-    // `git merge-base --is-ancestor buildSha head`: true = worker predates head (stale), false =
-    // equal or diverged (never claim "stale" on a match or an unrelated history), null = unknown
-    // (e.g. buildSha isn't a commit this repo knows about — never treat "unknown" as "stale").
-    internal static bool ShouldShowStaleWorkerBanner(string? buildSha, string? headSha, bool? isAncestor)
-    {
-        if (string.IsNullOrWhiteSpace(buildSha) || string.IsNullOrWhiteSpace(headSha)) return false;
-        if (string.Equals(buildSha, headSha, StringComparison.OrdinalIgnoreCase)) return false;
-        return isAncestor == true;
-    }
-
     [RelayCommand]
     private void OpenMissionControl()
     {

src/ClaudeDo.Ui/Views/MainWindow.axaml

@@ -259,29 +259,6 @@
       </StackPanel>
     </Border>
 
-    <!-- Stale-worker notice — bottom-right corner, above the update popup. Persistent
-         (no auto-dismiss timer): the running worker predates the selected list's merged
-         HEAD, so a restart is needed before "verified" claims against it are trustworthy. -->
-    <Border Grid.Row="0" Grid.RowSpan="3"
-            VerticalAlignment="Bottom" HorizontalAlignment="Right"
-            Margin="0,0,16,100"
-            ZIndex="100"
-            IsVisible="{Binding IsStaleWorkerBannerVisible}"
-            Background="{DynamicResource DeepBrush}"
-            BorderBrush="{DynamicResource LineBrush}"
-            BorderThickness="1"
-            CornerRadius="6"
-            Padding="14,10">
-      <StackPanel Spacing="8" Width="260">
-        <TextBlock Classes="body" Text="{loc:Tr shell.staleWorker.message}" TextWrapping="Wrap"/>
-        <StackPanel Orientation="Horizontal" Spacing="8" HorizontalAlignment="Right">
-          <Button Classes="btn"
-                  Content="{loc:Tr shell.menu.restartWorker}"
-                  Command="{Binding RestartWorkerCommand}"/>
-        </StackPanel>
-      </StackPanel>
-    </Border>
-
     <!-- External merge popup card — bottom-left corner, while an MCP session owns an
          unresolved unit-merge conflict. Does not auto-dismiss; stays until the merge ends. -->
     <Border Grid.Row="0" Grid.RowSpan="3"