LearnBoost Cluster Manager

This `cluster` package, developed by LearnBoost, is an extensible multi-core server manager for Node.js applications, last released as version 0.7.7. It was created to provide advanced process management features such as zero-downtime restarts, graceful shutdowns, worker resuscitation, and configurable worker counts (defaulting to CPU cores), during a period when the native Node.js `cluster` module was either unavailable or less feature-rich (specifically, between Node.js v0.4 and v0.8). The library offers a robust plugin system, including built-in plugins for command-line interfaces, debugging, logging, PID file management, automatic reloads, and REPL-based administration. Despite its innovative features for its time, the project is considered abandoned, with the last substantial development activity over a decade ago and official support for only very old Node.js versions (0.2.x, 0.4.x). It does not function with contemporary Node.js runtimes, making it a historical artifact rather than a viable solution for modern applications.