fix(logging): support stderr redirection on Darwin

[Edwin Ouko (oukoedwin)]

Summary

Add a Darwin implementation of RedirectStdErr using syscall.Dup2 .

Why this is needed

loggingRedirect.go  is compiled on macOS and calls RedirectStdErr, but that function was previously implemented only for Linux and Windows. Any Darwin build that imports pkg/logging therefore fails with:
undefined: RedirectStdErr

This issue affects Darwin consumers whenever pkg/logging enters their build graph. Adding the platform-specific implementation restores macOS compilation.

Darwin supports Dup2, rather than the Linux implementation’s Dup3, so it requires a platform-specific implementation.

Validation

•  go test ./pkg/logging 
• go test ./pkg/... 
• Cross-compiled pkg/logging for darwin/amd64
• Cross-compiled pkg/logging for darwin/arm64 

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[Edwin Ouko (oukoedwin)]

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