fix: redirect help content to stdout

[remyleone]

Closes #5513

[Copilot]

Pull request overview

Adjusts the CLI’s Cobra configuration so that --help/help content is emitted to stdout (per GNU CLI conventions), addressing issue #5513 and improving pipe/grep usability.

Changes:

• Route Cobra command output (SetOut) from stderr to stdout for the root command.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.34%. Comparing base (c1274be) to head (dd9e9f8).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5530   +/-   ##
=======================================
  Coverage   50.34%   50.34%           
=======================================
  Files         325      325           
  Lines       77694    77694           
=======================================
  Hits        39114    39114           
  Misses      37096    37096           
  Partials     1484     1484           

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