- release.yml: new linux-riscv64 job (cross-compiled on ubuntu-24.04 against
ports.ubuntu.com riscv64 libs, tar.gz only, CLI smoke-tested under QEMU),
ported from GridCraft; the draft release job needs it, so SHA256SUMS covers it.
- packaging/linux/package.sh: CROSS_ARCH/CROSS_TARGET/CROSS_COMPILE/EMULATOR
support, as in GridCraft.
- cargo xtask version set 0.6.0; README, hardware parity and ROADMAP log note
the new platform.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>