Replace cmake based unit test action with platformio#1

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adbancroft merged 4 commits intomasterfrom

Mar 16, 2026

Commits on Sep 25, 2025

Replace cmake unit test action with platformio
adbancroft
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Commits on Sep 26, 2025

Commits on Sep 27, 2025

main() rreturns the number of failing tests.
adbancroft
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