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.

src/ClaudeDo.Worker/ClaudeDo.Worker.csproj

@@ -27,6 +27,10 @@
     <ApplicationIcon>ClaudeTaskWorker.ico</ApplicationIcon>
   </PropertyGroup>
 
+  <ItemGroup>
+    <Using Include="ClaudeDo.Data.Wire" />
+  </ItemGroup>
+
   <ItemGroup>
     <InternalsVisibleTo Include="ClaudeDo.Worker.Tests" />
   </ItemGroup>