Configure Codecov to ignore examples & test helpers

[sashabaranov]

Summary

• add .codecov.yml with ignore patterns for examples/** and internal/test/**

Testing

• go vet ./...
• go test ./...

---

https://chatgpt.com/codex/tasks/task_e_68710cf9ed748325aeb54b78898c29a4

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.15%. Comparing base (575aff4) to head (fb6123b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1038      +/-   ##
==========================================
+ Coverage   87.57%   97.15%   +9.57%     
==========================================
  Files          43       34       -9     
  Lines        2415     2177     -238     
==========================================
  Hits         2115     2115              
+ Misses        281       43     -238     
  Partials       19       19              

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