add cross-architecture support so x86_64 binaries can run on ARM hosts and vice versa. plan: use [FEX-Emu](https://fex-emu.com/) for x86_64 → ARM. the reverse direction (ARM → x86_64) likely needs a different approach since FEX covers x86 → ARM only.
add cross-architecture support so x86_64 binaries can run on ARM hosts and vice versa.
plan: use FEX-Emu for x86_64 → ARM. the reverse direction (ARM → x86_64) likely needs a different approach since FEX covers x86 → ARM only.