Update CLAUDE.md to reference AGENTS.md and lean out AGENTS.md replacing agent.md

[tbavelier]

What does this PR do?

Follows best practice of https://code.claude.com/docs/en/best-practices and https://www.aihero.dev/a-complete-guide-to-agents-md with a smaller claude.md file to avoid filling the context + use agnostic AGENTS.md

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label
• All commits are signed (see: signing commits)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.03%. Comparing base (79c0824) to head (f8b4a27).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2905   +/-   ##
=======================================
  Coverage   40.03%   40.03%           
=======================================
  Files         319      319           
  Lines       28066    28066           
=======================================
  Hits        11235    11235           
  Misses      16008    16008           
  Partials      823      823           

Flag	Coverage Δ
unittests	40.03% <ø> (ø)

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[datadog-datadog-prod-us1]

✅ Code Coverage

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 40.11% (+0.00%)

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