The approach of using general programming languages instead of YAML for CI/CD is refreshing. I've seen too many teams struggle with YAML's complexity and limitations in complex pipelines. Being able to write actual code with proper IDE support, testing, and debugging is a game-changer. The SDK approach is smart too - makes it extensible across languages. Have you considered integration with GitHub Actions beyond the existing ones? That would significantly expand the user base.
The first section in the introduction describes a YAML file. Bait and switch?