fix(go): capture CLI stderr and fix SetProcessDone race#863

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claudiogodoy99 wants to merge 3 commits intogithub:mainfrom

claudiogodoy99:fix/capture-cli-stderr

Commits on Mar 15, 2026

test(go): validate stderr not captured and SetProcessDone race on process exit
claudiogodoy99
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fix(go): capture CLI stderr and fix SetProcessDone race
claudiogodoy99
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test(go): avoid breaking portability

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