Support new v3 devinfo and separate CLI tool#4

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tridge wants to merge 7 commits into

am32-firmware:mainfrom

tridge:cli-and-deviceinfo-magic

Commits on May 23, 2026

fix ESC addressing via bootloader deviceInfo magic addresses

tridge
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claude
committed

Commits on May 27, 2026

add SerialPortConnector_CLI headless protocol testbed

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claude
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parse structured v3 devinfo block and drive addressing off address_shift

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claude
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fourwayif: decode 256-byte read length sentinel in parseFourWayResponse

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claude
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widget: use devinfo_v3.tune_start for music region

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claude
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widget: read v3 devinfo block in direct (non-4-way) connect path

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claude
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widget: pad final firmware chunk to 8 bytes in on_writeBinary_clicked

tridge
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claude
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