Add Claude GitHub actions
Add the Claude Code GitHub actions associated with the Claude / GitHub integration.
The security recommendations here are implemented as follow up commits: https://chatgpt.com/share/e/693213d7-032c-8000-b36e-fa22ad663b64
With these changes, it is only possible to use Claude from PR comments. Possibly a moot point for this repo, since issues are disabled/hosted elsewhere.
Use only from comments is still useful: You can use it to conduct a review of code in the PR, or to add code/documentation to the (possibly stub) PR.
I think it might be good to outline what we're trying to (and not trying to) achieve with AI code reviews. Our north star on PR reviews comes from our changes guide.