rv: A Revolutionary Ruby Language Manager

After a decade of working on Bundler, the author has finally created rv, a new kind of Ruby management tool. rv not only manages gem dependencies but also Ruby versions, installing pre-compiled Rubies to eliminate lengthy compilation times. More importantly, rv makes running any Ruby script or tool trivial, even if it requires a different Ruby version. Inspired by uv (a similar tool for Python), cargo, and npm, rv boasts speed, reliability, and innovative features like `rv tool run` and `rv tool install`, simplifying Ruby environment management and dramatically boosting developer productivity.