supermachine-kernel vs omea-kernel vs supermachine-kernel-aarch64

Pre-built Linux kernel + in-VM assets for supermachine. A thin facade that re-exports the matching per-arch sub-crate (supermachine-kernel-aarch64 / supermachine-kernel-x86-64) by target_arch, so each `cargo build` downloads only its target's kernel. Pin in lockstep with `supermachine`.

Guest kernel facade for omea-vm: re-exports the x86_64 KVM kernel/init/agent asset crate.

Pre-built aarch64 Linux kernel image, in-VM init shim (init-oci), control agent, and smpark.ko for supermachine's HVF backend, bundled as xz-compressed payloads inside the crate (no network at build time). Resolved automatically per target by the `supermachine-kernel` facade; pin in lockstep with `supermachine`.