feat(worker): broadcast child TaskUpdated events on planning CRUD

So the UI refreshes individual child rows alongside the parent during
create/update/delete/finalize from the planning MCP service.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Worker/Planning/PlanningMcpService.cs

@@ -40,6 +40,7 @@ public sealed class PlanningMcpService
     {
         var ctx = _contextAccessor.Current;
         var child = await _tasks.CreateChildAsync(ctx.ParentTaskId, title, description, tags, commitType, cancellationToken);
+        await BroadcastTaskUpdatedAsync(child.Id, cancellationToken);
         await BroadcastTaskUpdatedAsync(ctx.ParentTaskId, cancellationToken);
         return new CreatedChildDto(child.Id, "Draft");
     }
@@ -83,6 +84,7 @@ public sealed class PlanningMcpService
 
         var reload = (await _tasks.GetByIdAsync(taskId, cancellationToken))!;
         var tagList = await _tasks.GetTagsAsync(reload.Id, cancellationToken);
+        await BroadcastTaskUpdatedAsync(reload.Id, cancellationToken);
         await BroadcastTaskUpdatedAsync(ctx.ParentTaskId, cancellationToken);
         return new ChildTaskDto(reload.Id, reload.Title, reload.Description, reload.Status.ToString(), tagList.Select(t => t.Name).ToList());
     }
@@ -101,6 +103,7 @@ public sealed class PlanningMcpService
             throw new InvalidOperationException("Cannot delete a finalized task.");
 
         await _tasks.DeleteAsync(taskId, cancellationToken);
+        await BroadcastTaskUpdatedAsync(taskId, cancellationToken);
         await BroadcastTaskUpdatedAsync(ctx.ParentTaskId, cancellationToken);
     }
 
@@ -121,7 +124,11 @@ public sealed class PlanningMcpService
         CancellationToken cancellationToken)
     {
         var ctx = _contextAccessor.Current;
+        var childIds = (await _tasks.GetChildrenAsync(ctx.ParentTaskId, cancellationToken))
+            .Select(c => c.Id).ToList();
         var count = await _tasks.FinalizePlanningAsync(ctx.ParentTaskId, queueAgentTasks, cancellationToken);
+        foreach (var id in childIds)
+            await BroadcastTaskUpdatedAsync(id, cancellationToken);
         await BroadcastTaskUpdatedAsync(ctx.ParentTaskId, cancellationToken);
         return count;
     }