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>

tests/ClaudeDo.Worker.Tests/Planning/PlanningMcpServiceTests.cs

@@ -16,29 +16,34 @@ file sealed class FakeHttpContextAccessor : IHttpContextAccessor
     public HttpContext? HttpContext { get; set; }
 }
 
-file sealed class NullHubClients : IHubClients
+file sealed class RecordingHubClients : IHubClients
 {
-    public IClientProxy All => NullClientProxy.Instance;
-    public IClientProxy AllExcept(IReadOnlyList<string> excludedConnectionIds) => NullClientProxy.Instance;
-    public IClientProxy Client(string connectionId) => NullClientProxy.Instance;
-    public IClientProxy Clients(IReadOnlyList<string> connectionIds) => NullClientProxy.Instance;
-    public IClientProxy Group(string groupName) => NullClientProxy.Instance;
-    public IClientProxy GroupExcept(string groupName, IReadOnlyList<string> excludedConnectionIds) => NullClientProxy.Instance;
-    public IClientProxy Groups(IReadOnlyList<string> groupNames) => NullClientProxy.Instance;
-    public IClientProxy User(string userId) => NullClientProxy.Instance;
-    public IClientProxy Users(IReadOnlyList<string> userIds) => NullClientProxy.Instance;
+    public RecordingClientProxy Proxy { get; } = new();
+    public IClientProxy All => Proxy;
+    public IClientProxy AllExcept(IReadOnlyList<string> excludedConnectionIds) => Proxy;
+    public IClientProxy Client(string connectionId) => Proxy;
+    public IClientProxy Clients(IReadOnlyList<string> connectionIds) => Proxy;
+    public IClientProxy Group(string groupName) => Proxy;
+    public IClientProxy GroupExcept(string groupName, IReadOnlyList<string> excludedConnectionIds) => Proxy;
+    public IClientProxy Groups(IReadOnlyList<string> groupNames) => Proxy;
+    public IClientProxy User(string userId) => Proxy;
+    public IClientProxy Users(IReadOnlyList<string> userIds) => Proxy;
 }
 
-file sealed class NullClientProxy : IClientProxy
+file sealed class RecordingClientProxy : IClientProxy
 {
-    public static readonly NullClientProxy Instance = new();
+    public List<(string Method, object?[] Args)> Calls { get; } = new();
     public Task SendCoreAsync(string method, object?[] args, CancellationToken cancellationToken = default)
-        => Task.CompletedTask;
+    {
+        Calls.Add((method, args));
+        return Task.CompletedTask;
+    }
 }
 
 file sealed class FakeHubContext : IHubContext<WorkerHub>
 {
-    public IHubClients Clients { get; } = new NullHubClients();
+    public RecordingHubClients RecordingClients { get; } = new();
+    public IHubClients Clients => RecordingClients;
     public IGroupManager Groups => throw new NotImplementedException();
 }
 
@@ -58,15 +63,25 @@ public sealed class PlanningMcpServiceTests : IDisposable
 
     public void Dispose() { _ctx.Dispose(); _db.Dispose(); }
 
+    private List<(string Method, object?[] Args)> _hubCalls = new();
+
     private PlanningMcpService BuildSut(string parentTaskId)
     {
         var httpContext = new DefaultHttpContext();
         httpContext.Items["PlanningContext"] = new PlanningMcpContext { ParentTaskId = parentTaskId };
         var accessor = new PlanningMcpContextAccessor(new FakeHttpContextAccessor { HttpContext = httpContext });
-        var broadcaster = new HubBroadcaster(new FakeHubContext());
+        var hub = new FakeHubContext();
+        _hubCalls = hub.RecordingClients.Proxy.Calls;
+        var broadcaster = new HubBroadcaster(hub);
         return new PlanningMcpService(_tasks, accessor, broadcaster);
     }
 
+    private IReadOnlyList<string> TaskUpdatedIds() =>
+        _hubCalls
+            .Where(c => c.Method == "TaskUpdated")
+            .Select(c => (string)c.Args[0]!)
+            .ToList();
+
     private async Task<TaskEntity> SeedPlanningParentAsync()
     {
         var listId = Guid.NewGuid().ToString();
@@ -178,4 +193,62 @@ public sealed class PlanningMcpServiceTests : IDisposable
         Assert.Equal(TaskStatus.Planned, loaded!.Status);
         Assert.Null(loaded.PlanningSessionToken);
     }
+
+    [Fact]
+    public async Task CreateChildTask_BroadcastsBothChildAndParent()
+    {
+        var parent = await SeedPlanningParentAsync();
+        var sut = BuildSut(parent.Id);
+
+        var result = await sut.CreateChildTask("c", null, null, null, CancellationToken.None);
+
+        var ids = TaskUpdatedIds();
+        Assert.Contains(result.TaskId, ids);
+        Assert.Contains(parent.Id, ids);
+    }
+
+    [Fact]
+    public async Task UpdateChildTask_BroadcastsBothChildAndParent()
+    {
+        var parent = await SeedPlanningParentAsync();
+        var c = await _tasks.CreateChildAsync(parent.Id, "c", null, null, null);
+        _ctx.ChangeTracker.Clear();
+
+        var sut = BuildSut(parent.Id);
+        await sut.UpdateChildTask(c.Id, "new title", null, null, null, CancellationToken.None);
+
+        var ids = TaskUpdatedIds();
+        Assert.Contains(c.Id, ids);
+        Assert.Contains(parent.Id, ids);
+    }
+
+    [Fact]
+    public async Task DeleteChildTask_BroadcastsBothChildAndParent()
+    {
+        var parent = await SeedPlanningParentAsync();
+        var c = await _tasks.CreateChildAsync(parent.Id, "c", null, null, null);
+
+        var sut = BuildSut(parent.Id);
+        await sut.DeleteChildTask(c.Id, CancellationToken.None);
+
+        var ids = TaskUpdatedIds();
+        Assert.Contains(c.Id, ids);
+        Assert.Contains(parent.Id, ids);
+    }
+
+    [Fact]
+    public async Task Finalize_BroadcastsEachChildAndParent()
+    {
+        var parent = await SeedPlanningParentAsync();
+        var c1 = await _tasks.CreateChildAsync(parent.Id, "c1", null, null, null);
+        var c2 = await _tasks.CreateChildAsync(parent.Id, "c2", null, null, null);
+
+        var sut = BuildSut(parent.Id);
+        await sut.Finalize(true, CancellationToken.None);
+
+        var ids = TaskUpdatedIds();
+        Assert.Contains(c1.Id, ids);
+        Assert.Contains(c2.Id, ids);
+        Assert.Contains(parent.Id, ids);
+    }
 }