As per this and more experimentation, it could be said Spark is the most competent and well engineered AI Assisted Code Environment.
Why? Because it’s GitHub, it has integrated the LLM in such a way that it seamlessly blends with GitHub Actions, Pages, Repositories, Secrets and Environments, Google had a great chance with FireStudio, but failed there.
GitHub seems to have taken a better and more engineered approach and not rushed it.