This looks nice! I like the idea of providing more deterministic feedback and more or less forcing the assistant to follow a particular development process. Do you have evidence that gtg improves the overall workflow? I think that there is a trade-off between risk of getting stuck (iteration without reaching gtg-green) versus reaching perfect 100% completion.

I found that it has improved overall code quality significantly, at the cost of somewhat slower velocity. But it has meant fewer interruptions where the ai is just waiting for me, or saying "Everything is ready!" only to find that ci/cd failed or there were clearly existing comments/issues.