fz v1.7.0 introduces
* Parallel builds: -j N flag (0 = auto = CPU cores) to compile multiple files concurrently.
* Linker script support: -T <file> and -Ttext <addr> passed to ld.
* Interactive shell: -shell provides a REPL with build, set, show, clean, watch commands.
* Extended output formats: elf32, elf64, bin (default elf64)