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a6a0a404ae
Mirror the libretiny/ltchiptool shape for RP2040 serial when --prebuilt-dir is set: open the user-supplied serial port at 1200 baud (arduino-pico's USB CDC interprets the open/close as a request to reboot into BOOTSEL), poll picotool until the BOOTSEL device shows up on the USB bus, then dispatch to upload_using_picotool with the prebuilt .uf2. This removes the last path that required --prebuilt-dir to contain a platformio.ini + .pioenvs/<name>/ tree, so upload_using_platformio is now only invoked when no prebuilt dir is set (i.e. the existing compile+upload flow on a developer machine). Issue: esphome/device-builder#572
