docs: update ai instructions and documentation

[gpeacock]

Updates the ai_workflow doc
and adds an AGENTS.md for those that look for it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.15%. Comparing base (8605e3c) to head (4c44f5e).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   65.15%   65.15%           
=======================================
  Files           2        2           
  Lines         815      815           
=======================================
  Hits          531      531           
  Misses        284      284           

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