chore(claude): add claude code support for maintainers

[zimeg]

Summary

This PR adds support for claude with the current project settings generated with the following command and a few adjustments:

/init

Permissions were gathered from similar changes to the CLI repo:

🔗 https://github.com/slackapi/slack-cli/blob/main/.claude/settings.json

Testing

We might make updates to these files as we find edges?

Category

• Others

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run ./scripts/install_all_and_run_tests.sh after making the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.67%. Comparing base (5a153e6) to head (501ed84).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## main #1445 +/- ##
=======================================
Coverage 90.67% 90.67% =======================================
Files 226 226 Lines 7205 7205 =======================================
Hits 6533 6533 Misses 672 672 

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[mwbrooks]

✅ Yay! Thanks for doing this @zimeg!

[WilliamBergamin]

Awesome working putting this together 💯 Looking forward on iterating on this 🚀

What do you think about centralizing this information by putting the contents of .claude/CLAUDE.md into an AGENTS.md and having the .claude/CLAUDE.md be something like

# CLAUDE.md
Persistent context, coding standards, and instructions for AI coding agents have been centralized to `AGENTS.md`.
**CRITICAL INSTRUCTION:** Before answering any questions, writing any code, or executing any commands in this repository, you MUST read the `AGENTS.md` file located in the root directory.
Proceed by silently reading `./AGENTS.md`, do not ask for permission to read it; just do it.

[WilliamBergamin]