Simplify example code

[phst]

No description provided.

[gemini-code-assist]

Important

Installation incomplete: to start using Gemini Code Assist, please ask the organization owner(s) to visit the Gemini Code Assist Admin Console and sign the Terms of Services.

[phst]

/gemini review

[gemini-code-assist]

Code Review

This pull request simplifies the example test code by replacing a complex io.Pipe and goroutine setup with a more straightforward cmd.CombinedOutput() and a loop to filter the output. This is a good improvement for readability and maintainability. However, I've found a critical issue in the new implementation of the output filtering loop that would cause a compilation error. Please see my comment for the details and a suggested fix.