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firmware/platformio/README.md

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+# PlatformIO
+
+PlatformIO is a good default once the first Arduino-style examples work.
+
+## Why Use It
+
+- Reproducible project configuration.
+- Clear dependency management.
+- Better structure for multiple examples.
+
+## Initial Rules
+
+- Each project should reference its lab.
+- `platformio.ini` should document board and framework.
+- Physical test procedure belongs in lab `firmware.md`, not only in code comments.