feat(helper): add privileged transactional core

internal/helper/lock_other.go

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: MIT
+
+//go:build !unix
+
+package helper
+
+// lockState is a no-op on platforms without advisory file locking. prx only
+// supports Unix-like systems; this exists so the package still builds elsewhere.
+func lockState(_ string) (func() error, error) {
+	return func() error { return nil }, nil
+}