Add telemetry tracking for deprecated set-output and save-state commands

- Add HasDeprecatedSetOutput and HasDeprecatedSaveState flags to GlobalContext
- Emit JobTelemetry once per job when deprecated commands are used
- Add unit tests verifying once-per-job telemetry behavior

src/Runner.Worker/ActionCommandManager.cs

@@ -318,6 +318,17 @@ namespace GitHub.Runner.Worker
                 context.AddIssue(issue, ExecutionContextLogOptions.Default);
             }
 
+            if (!context.Global.HasDeprecatedSetOutput)
+            {
+                context.Global.HasDeprecatedSetOutput = true;
+                var telemetry = new JobTelemetry
+                {
+                    Type = JobTelemetryType.ActionCommand,
+                    Message = "DeprecatedCommand: set-output"
+                };
+                context.Global.JobTelemetry.Add(telemetry);
+            }
+
             if (!command.Properties.TryGetValue(SetOutputCommandProperties.Name, out string outputName) || string.IsNullOrEmpty(outputName))
             {
                 throw new Exception("Required field 'name' is missing in ##[set-output] command.");
@@ -353,6 +364,17 @@ namespace GitHub.Runner.Worker
                 context.AddIssue(issue, ExecutionContextLogOptions.Default);
             }
 
+            if (!context.Global.HasDeprecatedSaveState)
+            {
+                context.Global.HasDeprecatedSaveState = true;
+                var telemetry = new JobTelemetry
+                {
+                    Type = JobTelemetryType.ActionCommand,
+                    Message = "DeprecatedCommand: save-state"
+                };
+                context.Global.JobTelemetry.Add(telemetry);
+            }
+
             if (!command.Properties.TryGetValue(SaveStateCommandProperties.Name, out string stateName) || string.IsNullOrEmpty(stateName))
             {
                 throw new Exception("Required field 'name' is missing in ##[save-state] command.");

src/Runner.Worker/GlobalContext.cs

@@ -31,5 +31,7 @@ namespace GitHub.Runner.Worker
         public JObject ContainerHookState { get; set; }
         public bool HasTemplateEvaluatorMismatch { get; set; }
         public bool HasActionManifestMismatch { get; set; }
+        public bool HasDeprecatedSetOutput { get; set; }
+        public bool HasDeprecatedSaveState { get; set; }
     }
 }

src/Test/L0/Worker/ActionCommandManagerL0.cs

@@ -457,6 +457,8 @@ namespace GitHub.Runner.Common.Tests.Worker
                 new SetEnvCommandExtension(),
                 new WarningCommandExtension(),
                 new AddMaskCommandExtension(),
+                new SetOutputCommandExtension(),
+                new SaveStateCommandExtension(),
             };
             foreach (var command in commands)
             {
@@ -499,5 +501,53 @@ namespace GitHub.Runner.Common.Tests.Worker
             };
         }
 
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetOutputCommand_EmitsTelemetryOnce()
+        {
+            using (TestHostContext hc = CreateTestContext())
+            {
+                _ec.Object.Global.JobTelemetry = new List<JobTelemetry>();
+                var reference = string.Empty;
+                _ec.Setup(x => x.SetOutput(It.IsAny<string>(), It.IsAny<string>(), out reference));
+
+                // First set-output should add telemetry
+                Assert.True(_commandManager.TryProcessCommand(_ec.Object, "::set-output name=foo::bar", null));
+                Assert.Single(_ec.Object.Global.JobTelemetry);
+                Assert.Equal(JobTelemetryType.ActionCommand, _ec.Object.Global.JobTelemetry[0].Type);
+                Assert.Equal("DeprecatedCommand: set-output", _ec.Object.Global.JobTelemetry[0].Message);
+                Assert.True(_ec.Object.Global.HasDeprecatedSetOutput);
+
+                // Second set-output should not add another telemetry entry
+                Assert.True(_commandManager.TryProcessCommand(_ec.Object, "::set-output name=foo2::bar2", null));
+                Assert.Single(_ec.Object.Global.JobTelemetry);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SaveStateCommand_EmitsTelemetryOnce()
+        {
+            using (TestHostContext hc = CreateTestContext())
+            {
+                _ec.Object.Global.JobTelemetry = new List<JobTelemetry>();
+                _ec.Setup(x => x.IsEmbedded).Returns(false);
+                _ec.Setup(x => x.IntraActionState).Returns(new Dictionary<string, string>());
+
+                // First save-state should add telemetry
+                Assert.True(_commandManager.TryProcessCommand(_ec.Object, "::save-state name=foo::bar", null));
+                Assert.Single(_ec.Object.Global.JobTelemetry);
+                Assert.Equal(JobTelemetryType.ActionCommand, _ec.Object.Global.JobTelemetry[0].Type);
+                Assert.Equal("DeprecatedCommand: save-state", _ec.Object.Global.JobTelemetry[0].Message);
+                Assert.True(_ec.Object.Global.HasDeprecatedSaveState);
+
+                // Second save-state should not add another telemetry entry
+                Assert.True(_commandManager.TryProcessCommand(_ec.Object, "::save-state name=foo2::bar2", null));
+                Assert.Single(_ec.Object.Global.JobTelemetry);
+            }
+        }
+
     }
 }