Fix #2947#2966

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cspotcode wants to merge 3 commits intocasey:masterfrom

cspotcode:fix-2947

Commits on Nov 21, 2025

add simple echoargs executable to be used in tests (possible precursor to just-test executable for #425)
cspotcode
committed
add failing test
cspotcode
committed
Set explicit $PATH on all spawned child processes on Windows
cspotcode
committed