jj v0.42.0 릴리스 - Git 호환 버전 관리 시스템

jj v0.42.0 brings significant improvements to a modern Git-compatible version control system developed by Google. The migration to mimalloc memory allocator enhances multi-threaded performance, while change ID-based evolution history in git fetch represents a major usability improvement for teams working with distributed repositories. These updates address both performance concerns and practical integration challenges, positioning jj as a compelling alternative VCS that maintains Git compatibility while offering advanced features.