Kernel standardizes Rust and post‑quantum auth

The Linux 7.0 release removes the 'experimental' label for Rust in-kernel code and adds ML‑DSA post‑quantum signatures for kernel module authentication while removing SHA‑1 signing. Together these are pragmatic steps: broadening a memory‑safe language's role in a critical OS and beginning a real cryptographic transition for kernel trust chains. — Shifts in kernel language policy and module‑auth cryptography affect driver ecosystems, supply‑chain security, and national/enterprise readiness for post‑quantum threats.