utility▌

Self-updater for gstack installs, including vendored/global detection and release summary output.

PDF generation skill for turning markdown documents into publication-style PDFs with proper layout, TOC, pagination, and print polish.

JUnit 5 patterns for testing utility classes, static methods, and pure functions without mocking complexity. \n \n Covers testing strategies for string manipulation, calculations, collections, data validation, and format utilities with edge case and boundary condition handling \n Uses AssertJ assertions for readable test code and @ParameterizedTest for testing multiple similar scenarios efficiently \n Emphasizes null handling, empty inputs, extreme values, and floating-point precision as critica