Xe2 compiler experiments.

**Work-in-progress, not ready for users/benchmarks.**

---

Jay is written by humans, not Large Language Models, due to our focus on
delivering high quality software and nurturing healthy software teams. For
information on the issues, see the notes of veteran Mesa developers like [Erik
Faye-Lund](https://kusma.xyz/blog/2026/03/26/open-source-and-ai/). Please
respect our wishes and do not send Jay patches that are not human authored.
Thank you!
