Fix GNSS UART crossover and flash the pico2 over USB - #70
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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The replacement GNSS (JS-AP55H carrier, genuine Septentrio mosaic-H inside)
was wired with the COM1 UART crossed relative to the firmware pins, so
bring-up hung on repeated setGNSSAttitude timeouts. Swapping the GNSS PIO
UART to GP6 (Pico TX -> module RXD1) / GP7 (Pico RX <- module TXD1) gets
COM1 talking both ways; AttEuler now streams (NO_ATTITUDE until the two
antennas are attached).
Also switch the pico2 upload_protocol to picotool so the board flashes over
its native USB instead of the CMSIS-DAP debug probe.