refactor(ipc): declare the SignalR wire DTOs once in ClaudeDo.Data

WorkerHub and IWorkerClient each carried their own copy of every record and
had already drifted — MergePreviewDto lost its verify fields on the client
side, two records disagreed on their name. They now live in Data/Wire.cs and
reach both sides via a <Using> item, so a hub signature change is a compile
error instead of a silently dropped JSON field.

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

@@ -94,8 +94,8 @@ public class MissionControlViewModelTests : IDisposable
 
     private sealed class SeededFakeWorker : StubWorkerClient
     {
-        public override IReadOnlyList<ActiveTask> GetActiveTasks()
-            => new[] { new ActiveTask("slot-1", "seed1", DateTime.UtcNow) };
+        public override IReadOnlyList<ActiveTaskDto> GetActiveTasks()
+            => new[] { new ActiveTaskDto("slot-1", "seed1", DateTime.UtcNow) };
     }
 
     // ── acceptance criterion (b): RefreshQueueAsync returns Running rows first ─