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J. Nick Koston
b8336cddf2
The libretiny upload path on `upload_program` SERIAL dispatch re-invokes PlatformIO (`pio run -t upload -t nobuild`), which needs a full build tree and `platformio.ini`. That makes it incompatible with a dashboard that only has prebuilt artifacts. Bypass PlatformIO for the libretiny+SERIAL+--prebuilt-dir case by calling `ltchiptool flash write -d <port> <firmware.uf2>` directly. The .uf2 encodes the chip family in its header so no extra config is needed. ltchiptool ships with the libretiny PlatformIO platform under ~/.platformio/penv/.libretiny/bin/ltchiptool; `get_ltchiptool_path()` prefers PATH first (pip install ltchiptool) and falls back to the PlatformIO penv. Without --prebuilt-dir the existing PlatformIO path remains in place, so this is purely additive. Issue: esphome/device-builder#572
