fix: gate Linux-only CLI smoke tests with cfg(target_os)

scan-memory and check-rootkit subcommands are #[cfg(target_os = "linux")],
their smoke tests must be gated the same way to pass on macOS CI.

Author: g1e2x87

crates/cli/tests/commands_smoke.rs

@@ -55,7 +55,9 @@ help_smoke_test!(help_schedule, "schedule");
 help_smoke_test!(help_policy, "policy");
 help_smoke_test!(help_daemon, "daemon");
 help_smoke_test!(help_scan_usb, "scan-usb");
+#[cfg(target_os = "linux")]
 help_smoke_test!(help_scan_memory, "scan-memory");
+#[cfg(target_os = "linux")]
 help_smoke_test!(help_check_rootkit, "check-rootkit");
 help_smoke_test!(help_webhook, "webhook");
 help_smoke_test!(help_email_alert, "email-alert");