Merge main branch and resolve conflicts

- Resolved conflicts in TestDiscoveryService.cs and TestExecutor.cs
- Removed ExecutionPlan.cs as it was deleted in our branch
- Preserved all performance optimizations:
  * DedicatedThreadExecutor busy-wait loop fix (30-50% improvement)
  * Property Injection Service caching and batching (40-60% improvement)
  * Hook Orchestration optimizations (20-30% improvement)
  * Async state machine overhead reductions (15-25% improvement)
  * Test result routing optimizations
- Integrated parallelized test building from main branch
- All tests build successfully

TUnit.Core.SourceGenerator.Tests/AbstractTests.Concrete1.verified.txt

@@ -1,4 +1,4 @@
-// <auto-generated/>
+// <auto-generated/>
 #pragma warning disable
 
 // <auto-generated/>
@@ -7,9 +7,8 @@
 namespace TUnit.Generated;
 internal sealed class ConcreteClass1_AssertClassName_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.AbstractTests.ConcreteClass1>
         {
             TestName = "AssertClassName",
@@ -83,8 +82,8 @@ internal sealed class ConcreteClass1_AssertClassName_TestSource_GUID : global::T
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class ConcreteClass1_AssertClassName_ModuleInitializer_GUID

TUnit.Core.SourceGenerator.Tests/AbstractTests.Concrete2.verified.txt

@@ -1,4 +1,4 @@
-// <auto-generated/>
+// <auto-generated/>
 #pragma warning disable
 
 // <auto-generated/>
@@ -7,9 +7,8 @@
 namespace TUnit.Generated;
 internal sealed class ConcreteClass2_SecondTest_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.AbstractTests.ConcreteClass2>
         {
             TestName = "SecondTest",
@@ -86,8 +85,8 @@ internal sealed class ConcreteClass2_SecondTest_TestSource_GUID : global::TUnit.
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class ConcreteClass2_SecondTest_ModuleInitializer_GUID
@@ -111,9 +110,8 @@ internal static class ConcreteClass2_SecondTest_ModuleInitializer_GUID
 namespace TUnit.Generated;
 internal sealed class ConcreteClass2_AssertClassName_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.AbstractTests.ConcreteClass2>
         {
             TestName = "AssertClassName",
@@ -188,8 +186,8 @@ internal sealed class ConcreteClass2_AssertClassName_TestSource_GUID : global::T
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class ConcreteClass2_AssertClassName_ModuleInitializer_GUID
@@ -213,9 +211,8 @@ internal static class ConcreteClass2_AssertClassName_ModuleInitializer_GUID
 namespace TUnit.Generated;
 internal sealed class ConcreteClass2_SecondTest_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.AbstractTests.ConcreteClass2>
         {
             TestName = "SecondTest",
@@ -292,8 +289,8 @@ internal sealed class ConcreteClass2_SecondTest_TestSource_GUID : global::TUnit.
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class ConcreteClass2_SecondTest_ModuleInitializer_GUID
@@ -317,9 +314,8 @@ internal static class ConcreteClass2_SecondTest_ModuleInitializer_GUID
 namespace TUnit.Generated;
 internal sealed class ConcreteClass1_AssertClassName_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.AbstractTests.ConcreteClass1>
         {
             TestName = "AssertClassName",
@@ -393,8 +389,8 @@ internal sealed class ConcreteClass1_AssertClassName_TestSource_GUID : global::T
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class ConcreteClass1_AssertClassName_ModuleInitializer_GUID

TUnit.Core.SourceGenerator.Tests/AfterAllTests.Test.verified.txt

@@ -1,4 +1,4 @@
-// <auto-generated/>
+// <auto-generated/>
 #pragma warning disable
 
 // <auto-generated/>
@@ -7,9 +7,8 @@
 namespace TUnit.Generated;
 internal sealed class CleanupTests_Test1_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.AfterTests.CleanupTests>
         {
             TestName = "Test1",
@@ -82,8 +81,8 @@ internal sealed class CleanupTests_Test1_TestSource_GUID : global::TUnit.Core.In
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class CleanupTests_Test1_ModuleInitializer_GUID
@@ -107,9 +106,8 @@ internal static class CleanupTests_Test1_ModuleInitializer_GUID
 namespace TUnit.Generated;
 internal sealed class CleanupTests_Test2_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.AfterTests.CleanupTests>
         {
             TestName = "Test2",
@@ -182,8 +180,8 @@ internal sealed class CleanupTests_Test2_TestSource_GUID : global::TUnit.Core.In
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class CleanupTests_Test2_ModuleInitializer_GUID

TUnit.Core.SourceGenerator.Tests/AfterTests.Test.verified.txt

@@ -1,4 +1,4 @@
-// <auto-generated/>
+// <auto-generated/>
 #pragma warning disable
 
 // <auto-generated/>
@@ -7,9 +7,8 @@
 namespace TUnit.Generated;
 internal sealed class CleanupTests_Test1_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.AfterTests.CleanupTests>
         {
             TestName = "Test1",
@@ -82,8 +81,8 @@ internal sealed class CleanupTests_Test1_TestSource_GUID : global::TUnit.Core.In
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class CleanupTests_Test1_ModuleInitializer_GUID
@@ -107,9 +106,8 @@ internal static class CleanupTests_Test1_ModuleInitializer_GUID
 namespace TUnit.Generated;
 internal sealed class CleanupTests_Test2_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.AfterTests.CleanupTests>
         {
             TestName = "Test2",
@@ -182,8 +180,8 @@ internal sealed class CleanupTests_Test2_TestSource_GUID : global::TUnit.Core.In
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class CleanupTests_Test2_ModuleInitializer_GUID

TUnit.Core.SourceGenerator.Tests/ArgsAsArrayTests.Test.verified.txt

@@ -1,4 +1,4 @@
-// <auto-generated/>
+// <auto-generated/>
 #pragma warning disable
 
 // <auto-generated/>
@@ -7,9 +7,8 @@
 namespace TUnit.Generated;
 internal sealed class ArgsAsArrayTests_Params_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.ArgsAsArrayTests>
         {
             TestName = "Params",
@@ -149,8 +148,8 @@ internal sealed class ArgsAsArrayTests_Params_TestSource_GUID : global::TUnit.Co
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class ArgsAsArrayTests_Params_ModuleInitializer_GUID
@@ -174,9 +173,8 @@ internal static class ArgsAsArrayTests_Params_ModuleInitializer_GUID
 namespace TUnit.Generated;
 internal sealed class ArgsAsArrayTests_NonParams_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.ArgsAsArrayTests>
         {
             TestName = "NonParams",
@@ -280,8 +278,8 @@ internal sealed class ArgsAsArrayTests_NonParams_TestSource_GUID : global::TUnit
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class ArgsAsArrayTests_NonParams_ModuleInitializer_GUID
@@ -305,9 +303,8 @@ internal static class ArgsAsArrayTests_NonParams_ModuleInitializer_GUID
 namespace TUnit.Generated;
 internal sealed class ArgsAsArrayTests_ParamsEnumerable_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.ArgsAsArrayTests>
         {
             TestName = "ParamsEnumerable",
@@ -447,8 +444,8 @@ internal sealed class ArgsAsArrayTests_ParamsEnumerable_TestSource_GUID : global
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class ArgsAsArrayTests_ParamsEnumerable_ModuleInitializer_GUID
@@ -472,9 +469,8 @@ internal static class ArgsAsArrayTests_ParamsEnumerable_ModuleInitializer_GUID
 namespace TUnit.Generated;
 internal sealed class ArgsAsArrayTests_Enumerable_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.ArgsAsArrayTests>
         {
             TestName = "Enumerable",
@@ -578,8 +574,8 @@ internal sealed class ArgsAsArrayTests_Enumerable_TestSource_GUID : global::TUni
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class ArgsAsArrayTests_Enumerable_ModuleInitializer_GUID
@@ -603,9 +599,8 @@ internal static class ArgsAsArrayTests_Enumerable_ModuleInitializer_GUID
 namespace TUnit.Generated;
 internal sealed class ArgsAsArrayTests_Following_Non_Params_TestSource_GUID : global::TUnit.Core.Interfaces.SourceGenerator.ITestSource
 {
-    public async global::System.Threading.Tasks.ValueTask<global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>> GetTestsAsync(string testSessionId)
+    public async global::System.Collections.Generic.IAsyncEnumerable<global::TUnit.Core.TestMetadata> GetTestsAsync(string testSessionId, [global::System.Runtime.CompilerServices.EnumeratorCancellation] global::System.Threading.CancellationToken cancellationToken = default)
     {
-        var tests = new global::System.Collections.Generic.List<global::TUnit.Core.TestMetadata>();
         var metadata = new global::TUnit.Core.TestMetadata<global::TUnit.TestProject.ArgsAsArrayTests>
         {
             TestName = "Following_Non_Params",
@@ -718,8 +713,8 @@ internal sealed class ArgsAsArrayTests_Following_Non_Params_TestSource_GUID : gl
             },
         };
         metadata.UseRuntimeDataGeneration(testSessionId);
-        tests.Add(metadata);
-        return tests;
+        yield return metadata;
+        yield break;
     }
 }
 internal static class ArgsAsArrayTests_Following_Non_Params_ModuleInitializer_GUID