systemd Adds Optional Rust Components

The systemd project has merged infrastructure allowing leaf systemd programs to be written in Rust (optional, toggled via Meson -Drust). It uses Meson-based builds (no Cargo), mandates C linkage, and a Rust-based systemd-keyring-setup utility is forthcoming for boot-time keyring and certificate provisioning. — This marks a meaningful shift in core OS infrastructure that affects security assumptions, build‑and‑packaging ecosystems, and who controls low-level platform code—issues that touch software supply chains and national‑security conversations about trusted computing components.