Add CLAUDE.md with linting instructions

[bendichter]

Summary

• Add CLAUDE.md to ensure ruff check . is run before pushing

Test plan

• Verify CI passes

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.21%. Comparing base (e00ffc0) to head (3a25c57).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #2167   +/-   ##
=======================================
  Coverage   95.21%   95.21%           
=======================================
  Files          29       29           
  Lines        2945     2945           
  Branches      757      757           
=======================================
  Hits         2804     2804           
  Misses         84       84           
  Partials       57       57           

Flag	Coverage Δ
integration	72.93% <ø> (ø)
unit	85.16% <ø> (ø)

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