feat(ui): Listen-Einstellungen — Checkbox fuer serialize_on_file_overlap

Das Flag war bisher nur ueber MCP set_list_config erreichbar. UpdateListConfigDto
fuehrt es tri-state (null = gespeicherten Wert behalten), damit nur das
Listen-Modal es setzen/loeschen kann und kein anderer Aufrufer es per Omission
verliert.

src/ClaudeDo.Ui/ViewModels/Agent/AgentConfigEditorViewModel.cs

@@ -189,10 +189,12 @@ public sealed partial class AgentConfigEditorViewModel : ViewModelBase, IDisposa
         catch { }
     }
 
-    // verifyCommand is a List-only field owned by ListSettingsModalViewModel (not this editor,
-    // which is also reused for Task scope); the caller passes it through so the single
-    // UpdateListConfig call carries the full desired row instead of clobbering it.
-    public async System.Threading.Tasks.Task SaveAsync(string? verifyCommand = null)
+    // verifyCommand and serializeOnFileOverlap are List-only fields owned by
+    // ListSettingsModalViewModel (not this editor, which is also reused for Task scope); the caller
+    // passes them through so the single UpdateListConfig call carries the full desired row instead
+    // of clobbering it.
+    public async System.Threading.Tasks.Task SaveAsync(
+        string? verifyCommand = null, bool? serializeOnFileOverlap = null)
     {
         if (TargetId is null) return;
         var model = string.IsNullOrWhiteSpace(Model) ? null : Model;
@@ -204,7 +206,7 @@ public sealed partial class AgentConfigEditorViewModel : ViewModelBase, IDisposa
         if (_scope == AgentConfigScope.Task)
             await _worker.UpdateTaskAgentSettingsAsync(new UpdateTaskAgentSettingsDto(TargetId, model, sp, ap, turns, skills));
         else
-            await _worker.UpdateListConfigAsync(new UpdateListConfigDto(TargetId, model, sp, ap, turns, skills, verifyCommand));
+            await _worker.UpdateListConfigAsync(new UpdateListConfigDto(TargetId, model, sp, ap, turns, skills, verifyCommand, serializeOnFileOverlap));
     }
 
     private List<string>? SelectedSessionSkillNames()

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

@@ -36,6 +36,9 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
     // Optional post-merge verification command (build/test), run in WorkingDir after a merge
     // lands; a non-zero exit keeps the task out of Done instead of silently reporting merged.
     [ObservableProperty] private string _verifyCommand = "";
+    // When on, the queue picker holds back a queued task whose declared scope globs overlap a
+    // running/awaiting-merge sibling in this list (ListConfigEntity.SerializeOnFileOverlap).
+    [ObservableProperty] private bool _serializeOnFileOverlap;
 
     public ObservableCollection<string> CommitTypeOptions { get; } = new(CommitTypeRegistry.Types);
 
@@ -71,6 +74,7 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
         await Agent.LoadForListAsync(listId, ct);
         var cfg = await _worker.GetListConfigAsync(listId);
         VerifyCommand = cfg?.VerifyCommand ?? "";
+        SerializeOnFileOverlap = cfg?.SerializeOnFileOverlap ?? false;
     }
 
     [RelayCommand]
@@ -84,7 +88,9 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
             IsManual,
             FindingsTracked));
 
-        await Agent.SaveAsync(string.IsNullOrWhiteSpace(VerifyCommand) ? null : VerifyCommand);
+        await Agent.SaveAsync(
+            string.IsNullOrWhiteSpace(VerifyCommand) ? null : VerifyCommand,
+            SerializeOnFileOverlap);
 
         CloseAction?.Invoke();
     }

src/ClaudeDo.Ui/Views/Modals/ListSettingsModalView.axaml

@@ -74,6 +74,13 @@
                 <TextBlock Text="{loc:Tr modals.listSettings.findingsTrackedHint}"
                            Opacity="0.6" FontSize="12" TextWrapping="Wrap"/>
               </StackPanel>
+
+              <StackPanel Spacing="4">
+                <CheckBox IsChecked="{Binding SerializeOnFileOverlap, Mode=TwoWay}"
+                          Content="{loc:Tr modals.listSettings.serializeOnFileOverlap}"/>
+                <TextBlock Text="{loc:Tr modals.listSettings.serializeOnFileOverlapHint}"
+                           Opacity="0.6" FontSize="12" TextWrapping="Wrap"/>
+              </StackPanel>
             </StackPanel>
           </Border>
         </StackPanel>