chore: add AGENTS.md file

[amanabiy]

Issue #, if available:

Description of changes:
Adds AGENTS.md file to this repository.

related: X2NaAdxtpFej 0w2zAaLmmgWn

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.03%. Comparing base (56bd7e1) to head (de4ac6b).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   96.96%   97.03%   +0.06%     
==========================================
  Files           9        9              
  Lines         330      337       +7     
  Branches       72       73       +1     
==========================================
+ Hits          320      327       +7     
  Misses         10       10              

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