Implement CarryoutG2Protocol based on cdavidson0522/winegard-sky-scan: prompt-terminated reads via '>' char, 115200 baud RS-422, h <id> motor homing, DVB/RSSI signal strength measurement. Update CLAUDE.md with G2 variant column, NVS index 20, dvb sub-commands, and wiring differences. CLI now accepts --firmware g2.
Description
Winegard satellite dish control for amateur radio sky tracking
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