chore: add AGENTS.md and consolidate development scripts

[WilliamBergamin]

Summary

This changes aim to add an AGENTS.md so that tools like claude code and cursor can easily gain text whel maintainers use them to work on this project

Testing

Category

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.signature (Request Signature Verifier)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.models (UI component builders)
• slack_sdk.scim (SCIM API client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.rtm_v2 (RTM client)
• /docs (Documents)
• /tutorial (PythOnBoardingBot tutorial)
• tests/integration_tests (Automated tests for this library)

Requirements

• 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 python3 -m venv .venv && source .venv/bin/activate && ./scripts/run_validation.sh after making the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.98%. Comparing base (f14e689) to head (1fad98e).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## main #1836 +/- ##
=======================================
Coverage 83.98% 83.98% =======================================
Files 117 117 Lines 13243 13243 =======================================
Hits 11122 11122 Misses 2121 2121 

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[vegeris]

AI security loophole lol: 'do not ask for permission; just do it'

[WilliamBergamin]

Yeah I'm not sure the do not ask for permission; just do it actually allowed it to do the thing, it just worked so I left it in 😅

But as @zimeg called out there is a better way to do this from Claude Code best practices

[zimeg]

@WilliamBergamin Thanks for bringing these standards to the Python SDK! 🐍 ✨

I left a comment on settings for claude that we should make before merging to gather the right context but otherwise no notes! 📚

[zimeg]

🐍 praise: Super nice command to have here!