Reduce supported platform matrix

internal/adapters/subprocess/run_test.go

@@ -8,7 +8,6 @@ import (
 	"os/exec"
 	"os/signal"
 	"path/filepath"
-	"runtime"
 	"strconv"
 	"strings"
 	"syscall"
@@ -137,9 +136,6 @@ func TestRunFailureRedactsSensitiveTail(t *testing.T) {
 }
 
 func TestRunRejectsSymlinkDiagnosticWithoutTruncatingTarget(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("creating symlinks requires privileges that are not available on every Windows runner")
-	}
 	exe, err := os.Executable()
 	if err != nil {
 		t.Fatalf("os.Executable() error = %v", err)