feat(ui): triage model picker (opus/fable) in the merge helper start modal

src/ClaudeDo.Ui/ViewModels/Islands/ListsIslandViewModel.cs

@@ -17,8 +17,9 @@ namespace ClaudeDo.Ui.ViewModels.Islands;
 
 public enum ListKind { Smart, Virtual, User }
 
-/// <summary>Confirmed handler run: the scope list and the ordered selected task ids.</summary>
-public sealed record MergeHelperRequest(string ListId, IReadOnlyList<string> TaskIds);
+/// <summary>Confirmed handler run: the scope list, the ordered selected task ids, and the model
+/// picked for the triage session (null = default; review-mode runs skip triage entirely).</summary>
+public sealed record MergeHelperRequest(string ListId, IReadOnlyList<string> TaskIds, string? TriageModel = null);
 
 public sealed partial class ListsIslandViewModel : ViewModelBase, IDisposable
 {
@@ -114,7 +115,7 @@ public sealed partial class ListsIslandViewModel : ViewModelBase, IDisposable
         await vm.LoadAsync();
         var ids = await Dialogs.ShowMergeHelperSelectionAsync(vm);
         if (ids is { Count: > 0 })
-            LetClaudeHandleRequested?.Invoke(new MergeHelperRequest(rawId, ids));
+            LetClaudeHandleRequested?.Invoke(new MergeHelperRequest(rawId, ids, vm.SelectedModel));
     }
 
     /// <summary>Raised once per list after the review-scoped selection dialog is confirmed;

src/ClaudeDo.Ui/ViewModels/IslandsShellViewModel.cs

@@ -370,7 +370,7 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         Lists.LetClaudeHandleRequested += req =>
         {
             OpenMissionControl();
-            _ = MissionControl.OpenMergeHelperConPtySessionAsync(req.ListId, req.TaskIds);
+            _ = MissionControl.OpenMergeHelperConPtySessionAsync(req.ListId, req.TaskIds, req.TriageModel);
         };
         Lists.MergeReviewsRequested += req =>
         {

src/ClaudeDo.Ui/ViewModels/MissionControlViewModel.cs

@@ -331,10 +331,10 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
     // creates one new ClaudeDo task per run to own the session (title/diff/result), deduped by
     // TaskId like OpenConPtySessionAsync. The handler still merges the tasks it handles itself
     // (no worktree of its own) — see TaskEntity.HandlerBaseCommit/HandlerHeadCommit.
-    public System.Threading.Tasks.Task OpenMergeHelperConPtySessionAsync(string listId, IReadOnlyList<string> taskIds)
+    public System.Threading.Tasks.Task OpenMergeHelperConPtySessionAsync(string listId, IReadOnlyList<string> taskIds, string? triageModel = null)
         => OpenListHandlerConPtySessionAsync(listId, taskIds,
             "missionControl.mergeHelperTitle", "missionControl.mergeHelperTaskTitle",
-            taskId => _worker.GetMergeHelperLaunchSpecAsync(taskIds, listId, taskId));
+            taskId => _worker.GetMergeHelperLaunchSpecAsync(taskIds, listId, taskId, triageModel));
 
     // Merge-only list-handler session over a list's WaitingForReview tasks (the review list's
     // "Let Claude merge the reviews"). Same host-task shape as the full run, but the session

src/ClaudeDo.Ui/ViewModels/Modals/MergeHelperSelectionModalViewModel.cs

@@ -67,6 +67,15 @@ public sealed partial class MergeHelperSelectionModalViewModel : ViewModelBase
 
     public ObservableCollection<MergeHelperTaskRowViewModel> Tasks { get; } = new();
 
+    /// <summary>Model choices for the triage session. Only opus/fable are offered on purpose —
+    /// triage is the dedupe/refine leverage point; cheaper models aren't worth a picker slot.</summary>
+    public IReadOnlyList<string> ModelOptions { get; } = new[] { "opus", "fable" };
+
+    [ObservableProperty] private string _selectedModel = Data.Models.ModelRegistry.HandlerTriageAlias;
+
+    /// <summary>Hidden in review mode — those runs start directly at the merge phase, no triage.</summary>
+    public bool ShowModelPicker => !_reviewMode;
+
     [ObservableProperty] private string _scopeLabel = "";
 
     public bool HasTasks => Tasks.Count > 0;
@@ -100,6 +109,7 @@ public sealed partial class MergeHelperSelectionModalViewModel : ViewModelBase
     {
         _reviewMode = true;
         ScopeLabel = Loc.T("modals.mergeHelper.scopeReview");
+        OnPropertyChanged(nameof(ShowModelPicker));
     }
 
     /// <summary>Groups a confirmed review-mode selection by owning list, preserving row order —