GHSA-9p38-94jf-hgjj: OpenClaw has macOS `system.run` allowlist bypass via quoted command substitution

In OpenClaw’s macOS node-host path, system.run allowlist parsing in security=allowlist mode failed to reject command substitution tokens when they appeared inside double-quoted shell text.

Because of that gap, payloads like echo "ok $(id)" could be treated as allowlist hits (first executable token echo) while still executing non-allowlisted subcommands through shell substitution.