fix(ui): Mission Control no longer lists finished operations as running

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tests/ClaudeDo.Ui.Tests/ViewModels/MissionControlRunningOperationsTests.cs

@@ -28,7 +28,13 @@ public class MissionControlRunningOperationsTests : IDisposable
     private sealed class FakeWorker : StubWorkerClient
     {
         public IReadOnlyList<RunningOperationDto> Snapshot { get; set; } = Array.Empty<RunningOperationDto>();
-        public override Task<IReadOnlyList<RunningOperationDto>> GetActiveOperationsAsync() => Task.FromResult(Snapshot);
+        /// <summary>When set, the snapshot call completes only once this source is resolved.</summary>
+        public TaskCompletionSource? Gate { get; set; }
+        public override async Task<IReadOnlyList<RunningOperationDto>> GetActiveOperationsAsync()
+        {
+            if (Gate is not null) await Gate.Task;
+            return Snapshot;
+        }
     }
 
     private static RunningOperationDto Op(string id, string kind, int? number, string title, string? listId = null) =>
@@ -78,6 +84,35 @@ public class MissionControlRunningOperationsTests : IDisposable
         Assert.False(vm.HasRunningOperations);
     }
 
+    [Fact]
+    public async Task EndedDuringPendingSnapshot_DoesNotReappear()
+    {
+        var gate = new TaskCompletionSource();
+        var worker = new FakeWorker { Snapshot = new[] { Op("a", OperationKinds.Merging, 1, "Task") }, Gate = gate };
+        var vm = BuildVm(worker);
+
+        var refresh = vm.RefreshOperationsAsync();
+        worker.RaiseOperationEnded("a");
+        gate.SetResult();
+        await refresh;
+
+        Assert.Empty(vm.RunningOperations);
+        Assert.False(vm.HasRunningOperations);
+    }
+
+    [Fact]
+    public async Task EndedBeforeStarted_LeavesNoRow()
+    {
+        var worker = new FakeWorker();
+        var vm = BuildVm(worker);
+        await vm.RefreshOperationsAsync();
+
+        worker.RaiseOperationEnded("a");
+        worker.RaiseOperationStarted(Op("a", OperationKinds.Merging, 1, "Task"));
+
+        Assert.Empty(vm.RunningOperations);
+    }
+
     [Fact]
     public async Task ConnectionRestored_ReplacesListWithFreshSnapshot()
     {