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PCNT (Pulse Counter) driver for RPM sensing.
Uses hardware unit 1 in edge-counting mode: both rising and falling edges increment the counter. The caller reads and resets the count periodically to derive RPM from pulse frequency.
ESP32 PCNT reference: https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/peripherals/pcnt.html