nnq-cli 0.5.2

Command-line tool for sending and receiving nanomsg SP messages on any NNQ socket type (REQ/REP, PUB/SUB, PUSH/PULL, PAIR). Supports Ruby eval (-e/-E), script handlers (-r), the virtual `pipe` socket with optional Ractor parallelism, multiple formats (ASCII, msgpack, Marshal), and Zstd compression. Like nngcat from libnng, but with Ruby superpowers.