chore: add AGENTS.md file

[jderochervlk]

I used this as a base and then asked Claude to expand it.

https://forum.rescript-lang.org/t/best-practice-developer-copilot-rules-for-react/6231/2?u=jderochervlk

[fhammerschmidt]

Cool but I think for Claude itself you still need a CLAUDE.md as well, right?

[jderochervlk]

Cool but I think for Claude itself you still need a CLAUDE.md as well, right?

Apparently yes. I don't use Claude, but from what I can see in the docs it doesn't know about the AGENTS.md file unless you reference it in a CLAUDE.md file. I added that in.

[github-actions]

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