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.Worker.Tests/UiVm/TasksIslandViewModelPlanningTests.cs

@@ -163,7 +163,7 @@ sealed class FakeWorkerClient : IWorkerClient
     public Task SetOnlineInboxConfigAsync(OnlineInboxConfigInputDto input) => Task.CompletedTask;
     public Task SetOnlineInboxAuthAsync(string refreshToken) => Task.CompletedTask;
     public Task ClearOnlineInboxAuthAsync() => Task.CompletedTask;
-    public IReadOnlyList<ActiveTask> GetActiveTasks() => System.Array.Empty<ActiveTask>();
+    public IReadOnlyList<ActiveTaskDto> GetActiveTasks() => System.Array.Empty<ActiveTaskDto>();
 
     public Task<UsageSnapshotDto?> GetUsageSnapshotAsync() => Task.FromResult<UsageSnapshotDto?>(null);
     public Task<UsageSnapshotDto?> RefreshUsageAsync() => Task.FromResult<UsageSnapshotDto?>(null);