style(tests): remove code regions from Scope tests

decisions/2026-01-21-no-code-regions.md (accepted, applyTo **/*.cs) forbids code regions. CSharpCodeBuilderTests.Scope.cs still contained two #region/#endregion pairs. Remove the four directives; no behavior change.

Author: samtrion

tests/NetEvolve.CodeBuilder.Tests.Unit/CSharpCodeBuilderTests.Scope.cs

@@ -4,8 +4,6 @@
 
 public partial class CSharpCodeBuilderTests
 {
-    #region Scope Tests
-
     [Test]
     public async Task Scope_Should_Create_Disposable_Handler()
     {
@@ -138,10 +136,6 @@ public async Task Scope_With_Tabs_Should_Use_Tab_Indentation()
         _ = await Assert.That(result).IsEqualTo("{" + Environment.NewLine + "\tHello}" + Environment.NewLine);
     }
 
-    #endregion
-
-    #region ScopeLine Tests
-
     [Test]
     public async Task ScopeLine_Should_Append_Line_Before_Scope()
     {
@@ -432,6 +426,4 @@ public class Person
             """.Replace("\r\n", "\n", StringComparison.Ordinal);
         _ = await Assert.That(result).IsEqualTo(expected);
     }
-
-    #endregion
 }