Bump System.Threading.Channels from 8.0.0 to 10.0.3

---
updated-dependencies:
- dependency-name: System.Threading.Channels
  dependency-version: 10.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

src/Runner.Sdk/Runner.Sdk.csproj

@@ -17,7 +17,7 @@
   <ItemGroup>
     <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
     <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
-    <PackageReference Include="System.Threading.Channels" Version="8.0.0" />
+    <PackageReference Include="System.Threading.Channels" Version="10.0.3" />
   </ItemGroup>
 
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">

src/Runner.Worker/ExecutionContext.cs

@@ -77,7 +77,8 @@ namespace GitHub.Runner.Worker
 
         List<string> StepEnvironmentOverrides { get; }
 
-        IExecutionContext Root { get; }
+        ExecutionContext Root { get; }
+        ExecutionContext Parent { get; }
 
         // Initialize
         void InitializeJob(Pipelines.AgentJobRequestMessage message, CancellationToken token);
@@ -250,9 +251,7 @@ namespace GitHub.Runner.Worker
             }
         }
 
-        IExecutionContext IExecutionContext.Root => Root;
-
-        private ExecutionContext Root
+        public ExecutionContext Root
         {
             get
             {
@@ -267,7 +266,13 @@ namespace GitHub.Runner.Worker
             }
         }
 
-
+        public ExecutionContext Parent
+        {
+            get
+            {
+                return _parentExecutionContext;
+            }
+        }
 
         public JobContext JobContext
         {

src/Runner.Worker/PipelineTemplateEvaluatorWrapper.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Threading;
 using GitHub.Actions.WorkflowParser;
 using GitHub.DistributedTask.Expressions2;
 using GitHub.DistributedTask.ObjectTemplating.Tokens;
@@ -227,12 +226,8 @@ namespace GitHub.Runner.Worker
             Func<TNew> newEvaluator,
             Func<TLegacy, TNew, bool> resultComparer)
         {
-            // Use the root (job-level) cancellation token to detect cancellation race conditions.
-            // The step-level token only fires on step timeout, not on job cancellation.
-            // Job cancellation mutates JobContext.Status which expression functions read,
-            // so we need the root token to properly detect cancellation between evaluator runs.
-            var rootCancellationToken = _context.Root?.CancellationToken ?? CancellationToken.None;
-            var cancellationRequestedBefore = rootCancellationToken.IsCancellationRequested;
+            // Capture cancellation state before evaluation
+            var cancellationRequestedBefore = _context.CancellationToken.IsCancellationRequested;
 
             // Legacy evaluator
             var legacyException = default(Exception);
@@ -266,7 +261,7 @@ namespace GitHub.Runner.Worker
                 }
 
                 // Capture cancellation state after evaluation
-                var cancellationRequestedAfter = rootCancellationToken.IsCancellationRequested;
+                var cancellationRequestedAfter = _context.CancellationToken.IsCancellationRequested;
 
                 // Compare results or exceptions
                 bool hasMismatch = false;

src/Test/L0/Worker/PipelineTemplateEvaluatorWrapperL0.cs

@@ -19,7 +19,6 @@ namespace GitHub.Runner.Common.Tests.Worker
     public sealed class PipelineTemplateEvaluatorWrapperL0
     {
         private CancellationTokenSource _ecTokenSource;
-        private CancellationTokenSource _rootTokenSource;
         private Mock<IExecutionContext> _ec;
         private TestHostContext _hc;
 
@@ -66,7 +65,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 var wrapper = new PipelineTemplateEvaluatorWrapper(_hc, _ec.Object, allowServiceContainerCommand: false);
 
-                // Call EvaluateAndCompare directly: the new evaluator cancels the root token
+                // Call EvaluateAndCompare directly: the new evaluator cancels the token
                 // and returns a different value, forcing hasMismatch = true.
                 // Because cancellation flipped during the evaluation window, the
                 // mismatch should be skipped.
@@ -75,7 +74,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                     () => "legacy-value",
                     () =>
                     {
-                        _rootTokenSource.Cancel();
+                        _ecTokenSource.Cancel();
                         return "different-value";
                     },
                     (legacy, @new) => string.Equals(legacy, @new, StringComparison.Ordinal));
@@ -89,43 +88,6 @@ namespace GitHub.Runner.Common.Tests.Worker
             }
         }
 
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public void EvaluateAndCompare_SkipsMismatchRecording_WhenRootCancellationOccursBetweenEvaluators()
-        {
-            // Simulates job-level cancellation firing between legacy and new evaluator runs.
-            // Root is mocked with a separate CancellationTokenSource to exercise the
-            // _context.Root?.CancellationToken path (the job-level token).
-            try
-            {
-                Setup();
-                _ec.Object.Global.Variables.Set(Constants.Runner.Features.CompareWorkflowParser, "true");
-
-                var wrapper = new PipelineTemplateEvaluatorWrapper(_hc, _ec.Object, allowServiceContainerCommand: false);
-
-                // Legacy evaluator cancels the root token (simulating job cancel) and returns a value.
-                // The new evaluator returns a different value. The mismatch should be skipped.
-                var result = wrapper.EvaluateAndCompare<string, string>(
-                    "TestRootCancellationSkip",
-                    () =>
-                    {
-                        var legacyValue = "legacy-value";
-                        _rootTokenSource.Cancel();
-                        return legacyValue;
-                    },
-                    () => "different-value",
-                    (legacy, @new) => string.Equals(legacy, @new, StringComparison.Ordinal));
-
-                Assert.Equal("legacy-value", result);
-                Assert.False(_ec.Object.Global.HasTemplateEvaluatorMismatch);
-            }
-            finally
-            {
-                Teardown();
-            }
-        }
-
         [Fact]
         [Trait("Level", "L0")]
         [Trait("Category", "Worker")]
@@ -900,8 +862,6 @@ namespace GitHub.Runner.Common.Tests.Worker
         {
             _ecTokenSource?.Dispose();
             _ecTokenSource = new CancellationTokenSource();
-            _rootTokenSource?.Dispose();
-            _rootTokenSource = new CancellationTokenSource();
 
             _hc = new TestHostContext(this, name);
 
@@ -917,9 +877,6 @@ namespace GitHub.Runner.Common.Tests.Worker
                     WriteDebug = true,
                 });
             _ec.Setup(x => x.CancellationToken).Returns(_ecTokenSource.Token);
-            var rootEc = new Mock<IExecutionContext>();
-            rootEc.Setup(x => x.CancellationToken).Returns(_rootTokenSource.Token);
-            _ec.Setup(x => x.Root).Returns(rootEc.Object);
             _ec.Setup(x => x.ExpressionValues).Returns(expressionValues);
             _ec.Setup(x => x.ExpressionFunctions).Returns(expressionFunctions);
             _ec.Setup(x => x.Write(It.IsAny<string>(), It.IsAny<string>())).Callback((string tag, string message) => { _hc.GetTrace().Info($"{tag}{message}"); });
@@ -928,7 +885,6 @@ namespace GitHub.Runner.Common.Tests.Worker
 
         private void Teardown()
         {
-            _rootTokenSource?.Dispose();
             _hc?.Dispose();
         }
     }