Set up golangci-lint locally for comprehensive linting

[mheadd]

Summary

While our CI uses golangci-lint in GitHub Actions, developers should have it installed locally to catch issues before pushing. This provides faster feedback and catches more issues than the basic go vet checks.

Tasks:

• Document installation instructions in README:
  • macOS: brew install golangci-lint
  • Linux: curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin
  • Windows: go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
• Update developer setup documentation
• Add VS Code settings recommendations for auto-linting
• Consider adding pre-commit hooks with golangci-lint

Current Status:

• .golangci.yml configuration file already exists
• CI workflow uses golangci-lint successfully
• make lint falls back to basic checks if golangci-lint not installed

Benefits:

• Catches 15+ types of common Go issues
• Finds unused code, inefficient constructs, style violations
• Provides consistent code quality across the team