feat(worker): register planning services and add Merge-all hub methods

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/ClaudeDo.Worker.Tests/Hub/PlanningHubTests.cs

@@ -50,7 +50,7 @@ public sealed class PlanningHubTests : IDisposable
     {
         var hub = new WorkerHub(
             null!, null!, null!, null!, null!, null!, null!, null!,
-            _planning, _launcher);
+            _planning, _launcher, null!, null!);
         hub.Clients = new FakeHubCallerClients(_proxy);
         hub.Context = new FakeHubCallerContext();
         return hub;