Reduce supported platform matrix

internal/config/pipeline_composition_test.go

@@ -4,7 +4,6 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
-	"runtime"
 	"slices"
 	"strings"
 	"testing"
@@ -277,9 +276,6 @@ func TestLoadPipelineCompositionRejectsUnsafeOrInvalidImports(t *testing.T) {
 
 func TestLoadPipelineCompositionRejectsSameFileAliasesAndImportedComposition(t *testing.T) {
 	t.Run("same file through hard link", func(t *testing.T) {
-		if runtime.GOOS == "windows" {
-			t.Skip("hard-link identity behavior is platform-specific")
-		}
 		dir := t.TempDir()
 		writePipelineSource(t, dir, "one.yml", "workspace:\n  root: /work\n")
 		if err := os.Link(filepath.Join(dir, "one.yml"), filepath.Join(dir, "two.yml")); err != nil {