fix(claude-do): merge fix(worker): List-Handler-Session kennt ihre eigene Handler-

ClaudeDo-Task: 997d0ffa-48ae-42d7-bea0-3aed4cf81768

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

@@ -130,8 +130,10 @@ public interface IWorkerClient : INotifyPropertyChanged
     /// no task, no worktree.</summary>
     Task<LaunchSpec> GetAdHocLaunchSpecAsync(string directory, CancellationToken ct = default);
     /// <summary>Launch spec for an embedded ConPTY "merge helper" session that drives the given
-    /// tasks to a merged/Done state. listId scopes the session (and cwd) to that list.</summary>
-    Task<LaunchSpec> GetMergeHelperLaunchSpecAsync(IReadOnlyList<string> taskIds, string listId, CancellationToken ct = default);
+    /// tasks to a merged/Done state. listId scopes the session (and cwd) to that list.
+    /// handlerTaskId (from CreateMergeHelperTaskAsync) is rendered into the brief so the session
+    /// can call handoff_list_handler on its own handler task.</summary>
+    Task<LaunchSpec> GetMergeHelperLaunchSpecAsync(IReadOnlyList<string> taskIds, string listId, string handlerTaskId, CancellationToken ct = default);
     /// <summary>Creates the ClaudeDo task that owns a list-handler run (one per run, Idle/IsManual,
     /// never queued) so the ConPTY tile can be task-based instead of ad-hoc. Returns the new task id.</summary>
     Task<string> CreateMergeHelperTaskAsync(

src/ClaudeDo.Ui/Services/WorkerClient.cs

@@ -614,8 +614,8 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
     public async Task<LaunchSpec> GetAdHocLaunchSpecAsync(string directory, CancellationToken ct = default)
         => await InvokeTimedAsync<LaunchSpec>("GetAdHocLaunchSpec", () => _hub.InvokeAsync<LaunchSpec>("GetAdHocLaunchSpec", directory, ct));
 
-    public async Task<LaunchSpec> GetMergeHelperLaunchSpecAsync(IReadOnlyList<string> taskIds, string listId, CancellationToken ct = default)
-        => await InvokeTimedAsync<LaunchSpec>("GetMergeHelperLaunchSpec", () => _hub.InvokeAsync<LaunchSpec>("GetMergeHelperLaunchSpec", taskIds, listId, ct));
+    public async Task<LaunchSpec> GetMergeHelperLaunchSpecAsync(IReadOnlyList<string> taskIds, string listId, string handlerTaskId, CancellationToken ct = default)
+        => await InvokeTimedAsync<LaunchSpec>("GetMergeHelperLaunchSpec", () => _hub.InvokeAsync<LaunchSpec>("GetMergeHelperLaunchSpec", taskIds, listId, handlerTaskId, ct));
 
     public async Task<string> CreateMergeHelperTaskAsync(
         IReadOnlyList<string> taskIds, string listId, string title, string descriptionHeader, CancellationToken ct = default)

src/ClaudeDo.Ui/ViewModels/MissionControlViewModel.cs

@@ -279,7 +279,7 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
             }
 
             AddConPtyPane(new ConPtyPaneViewModel(taskId, title,
-                () => DescribeAsync(() => _worker.GetMergeHelperLaunchSpecAsync(taskIds, listId))));
+                () => DescribeAsync(() => _worker.GetMergeHelperLaunchSpecAsync(taskIds, listId, taskId))));
         }
         finally
         {