feat(worker): MCP tools update_planning_task and finalize

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

@@ -104,4 +104,31 @@ public sealed class PlanningMcpServiceTests : IDisposable
 
         Assert.Null(await _tasks.GetByIdAsync(c.Id));
     }
+
+    [Fact]
+    public async Task UpdatePlanningTask_SetsTitleAndDescription()
+    {
+        var parent = await SeedPlanningParentAsync();
+
+        await _sut.UpdatePlanningTask(Ctx(parent.Id), "new title", "new desc", CancellationToken.None);
+
+        var loaded = await _tasks.GetByIdAsync(parent.Id);
+        Assert.Equal("new title", loaded!.Title);
+        Assert.Equal("new desc", loaded.Description);
+    }
+
+    [Fact]
+    public async Task Finalize_PromotesDraftsAndInvalidatesToken()
+    {
+        var parent = await SeedPlanningParentAsync();
+        await _tasks.CreateChildAsync(parent.Id, "c1", null, null, null);
+        await _tasks.CreateChildAsync(parent.Id, "c2", null, null, null);
+
+        var count = await _sut.Finalize(Ctx(parent.Id), true, CancellationToken.None);
+
+        Assert.Equal(2, count);
+        var loaded = await _tasks.GetByIdAsync(parent.Id);
+        Assert.Equal(TaskStatus.Planned, loaded!.Status);
+        Assert.Null(loaded.PlanningSessionToken);
+    }
 }