Use AGENTS.md, update hooks and rules.

[hmgaudecker]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.70%. Comparing base (834712d) to head (c21ef78).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #79   +/-   ##
=======================================
  Coverage   96.70%   96.70%           
=======================================
  Files          26       26           
  Lines        1306     1306           
=======================================
  Hits         1263     1263           
  Misses         43       43           

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