Function build 

pub fn build(manifest_dir: &str, bin_name: &str) -> PathBuf

Build a PVM2 blob from a service crate. The guest is built for the RV64EMC + Zbb/Zba/Zbs/Zicond/Zicclsm target and the ELF is linked via [javm_transpiler::linker::link_elf] — Image::code holds raw RV+C+custom-0 bytes consumed directly by the recompiler / interpreter.