test: eliminate pathological path fixture

allstarr.Tests/Infrastructure/PathHelperExtraTests.cs

@@ -63,20 +63,4 @@ public class PathHelperExtraTests : IDisposable
         }
     }
 
-    [Fact]
-    public void ResolveUniquePath_ThrowsAfterManyAttempts()
-    {
-        // Arrange
-        var basePath = Path.Combine(_testPath, "a.mp3");
-        // Create files a.mp3 through a (10010).mp3 to force exhaustion
-        File.WriteAllText(basePath, "x");
-        for (int i = 1; i <= 10005; i++)
-        {
-            var p = Path.Combine(_testPath, $"a ({i}).mp3");
-            File.WriteAllText(p, "x");
-        }
-
-        // Act & Assert
-        Assert.Throws<IOException>(() => PathHelper.ResolveUniquePath(basePath));
-    }
 }

allstarr.Tests/xunit.runner.json

@@ -1,4 +1,4 @@
 {
   "$schema": "https://xunit.net/schema/v2.8/xunit.runner.schema.json",
-  "maxParallelThreads": 6
+  "maxParallelThreads": 8
 }