chore: initial GEMINI.md file

[coryan]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.71%. Comparing base (e836fe5) to head (f52b4a6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2952   +/-   ##
=======================================
  Coverage   96.71%   96.71%           
=======================================
  Files         105      105           
  Lines        4353     4353           
=======================================
  Hits         4210     4210           
  Misses        143      143           

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