Contributor guide for developing BESSER itself (https://github.com/BESSER-PEARL/BESSER). Use this skill whenever the user is working *inside* the BESSER source tree — adding a new generator (the most common contribution), adding a new metamodel or sub-DSL under `besser/BUML/metamodel/`, writing pyte
Contributor guide for developing BESSER itself (https://github.com/BESSER-PEARL/BESSER). Use this skill whenever the user is working *inside* the BESSER source tree — adding a new generator (the most common contribution), adding a new metamodel or sub-DSL under `besser/BUML/metamodel/`, writing pytest tests for generators or metamodels, writing JSON↔BUML converters for the web editor, building Sph