urun: Minimal Test Runner

urun is a minimal, file-based test runner for Node.js environments. Currently at version 0.0.8, its development appears to be abandoned, with the last significant update to its `package.json` occurring 12 years ago and the last commit 13 years ago. It was designed for simplicity, running `test-*.js` files by default within a specified directory, providing a progress indication, and showing detailed output only for failing tests unless `verbose` mode is enabled. Its key differentiators include its extremely lightweight footprint and direct CommonJS `require` based usage, eschewing complex configuration or modern CLI tools. It offers basic reporter options like 'BashReporter' and 'BashTapReporter' for TAP-compliant output.