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 97.38%. Comparing base (c76c5a2) to head (32968b3).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   96.75%   97.38%   +0.62%     
==========================================
  Files          11       11              
  Lines         864      918      +54     
  Branches      290      295       +5     
==========================================
+ Hits          836      894      +58     
+ Misses         28       24       -4     

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