Add AGENTS.md and cursor rules

[singlesp]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.87%. Comparing base (b42a2e5) to head (4469d00).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1590   +/-   ##
=======================================
  Coverage   82.87%   82.87%           
=======================================
  Files          58       58           
  Lines        7922     7922           
  Branches     1130     1130           
=======================================
  Hits         6565     6565           
  Misses       1015     1015           
  Partials      342      342           

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