Update golangci-lint to v2

[cugu]

Summary

• bump golangci-lint binary to v2.2.2
• use golangci/golangci-lint-action v8
• update .golangci.yml to v2 configuration

Testing

• go test ./...

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https://chatgpt.com/codex/tasks/task_e_687372a543108332a62c78bba2b47342

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.77%. Comparing base (0a85836) to head (19504a6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #49   +/-   ##
=======================================
  Coverage   64.77%   64.77%           
=======================================
  Files           4        4           
  Lines          88       88           
=======================================
  Hits           57       57           
  Misses         23       23           
  Partials        8        8           

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