mach v1.6.0 — aarch64-linux debut First 64-bit ARM target: mach cross-compiles and self-hosts on aarch64-linux (AAPCS64) alongside x86_64-linux and windows, byte-identical under qemu. Includes the #1458 parser fix. Ships without variadic formatting on aarch64 (deferred to v1.6.x). See CHANGELOG.md [1.6.0].