style: replace en dashes with hyphens in test comments

Agent-Logs-Url: https://github.com/GeneralLibrary/GeneralUpdate/sessions/6c694de5-ffd1-4c1e-bff3-6dc8faf754fe

Co-authored-by: JusterZhu <11714536+JusterZhu@users.noreply.github.com>

Author: Copilot

src/c#/DifferentialTest/Matchers/MatcherTests.cs

@@ -185,7 +185,7 @@ public void DefaultCleanMatcher_ReturnsNull_WhenNewFileDoesNotExist()
         [Fact]
         public void DefaultCleanMatcher_ReturnsCorrectNode_WhenSameNameFilesExistInDifferentDirectories()
         {
-            // Arrange – two old files with the same name but different relative paths
+            // Arrange - two old files with the same name but different relative paths
             var fileInRoot = Path.Combine(_testDirectory, "a.txt");
             var subDir = Path.Combine(_testDirectory, "sub");
             Directory.CreateDirectory(subDir);
@@ -198,7 +198,7 @@ public void DefaultCleanMatcher_ReturnsCorrectNode_WhenSameNameFilesExistInDiffe
             var oldFileRoot = new FileNode { Name = "a.txt", FullName = fileInRoot, RelativePath = "a.txt" };
             var oldFileSub  = new FileNode { Name = "a.txt", FullName = fileInSub,  RelativePath = "sub/a.txt" };
 
-            // oldFileRoot appears first in the list – before the fix FirstOrDefault would
+            // oldFileRoot appears first in the list - before the fix FirstOrDefault would
             // return oldFileRoot, then the RelativePath guard would return null, hiding oldFileSub.
             var leftNodes = new List<FileNode> { oldFileRoot, oldFileSub };
 
@@ -207,7 +207,7 @@ public void DefaultCleanMatcher_ReturnsCorrectNode_WhenSameNameFilesExistInDiffe
             // Act
             var result = matcher.Match(newFile, leftNodes);
 
-            // Assert – must find oldFileSub, not be tricked by oldFileRoot
+            // Assert - must find oldFileSub, not be tricked by oldFileRoot
             Assert.NotNull(result);
             Assert.Same(oldFileSub, result);
         }