Express-style Middleware Executor

execute-middleware is a JavaScript utility designed for the standalone execution of Express-style middleware logic, outside of a full Express application. It processes both standard middleware (expecting `(req, res, next)`) and error-handling middleware (expecting `(err, req, res, next)`), automatically differentiating between them by the number of arguments. The library supports complex nesting of middleware arrays and correctly handles error propagation: when `next(err)` is called, subsequent normal middleware is skipped until an error handler is encountered. It offers both serial and concurrent execution modes for middleware chains. The current stable version is 1.0.3. While no explicit release cadence is stated, it appears to be a mature, stable utility providing a focused solution for running Express middleware patterns in a more controlled or isolated environment.