> require them to be majority hand written.
We should specify the outcome not the process. Expecting the contributor to understand the patch is a good idea.
> Juniors may be encouraged/required to elide LLM-assisted tooling for a period of time during their onboarding.
This is a terrible idea. Onboarding is a lot of random environment setup hitches that LLMs are often really good at. It's also getting up to speed on code and docs and I've got some great text search/summarizing tools to share.