feat: add CLAUDE.md to share project guidelines with claude code

[thoo]

Summary

• Add CLAUDE.md that directs Claude Code to read AGENTS.md for all project guidelines
• Enables AI tools to automatically follow project conventions when creating PRs

Changes

• Created CLAUDE.md with simple reference to AGENTS.md
• Ensures consistent code style, import patterns, and testing practices in AI-generated contributions

Closes #2027

[google-cla]

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[hangfei]

Thanks @thoo . Do you know if Claude can follow that file or we need some links?

[thoo]

It does. I have been using the similar setup in openai-agent-sdk here with claude code.

[surajksharma07]

Hi @thoo and thanks to everyone who participated in this thread.

We're currently doing some housekeeping on our pull request queue. Given the rapid pace of development and the number of updates since this was last active, there's a good chance this pull request needs to be caught up to the latest version. To help us keep our backlog focused on current pull requests, we are closing this as stale.

If you're still interested in contributing to this change, could you please update to the very latest version of the library and create a new pull request? Our team will be glad to help with the refreshed PRs and answer any questions!

Thanks for your contribution and understanding!