Document 6 variant branches (saltylab/dev, saltyrover/dev, saltytank/dev), promotion rules, and agent targeting conventions. Remove resolved USB CDC blocker note. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Merge pull request 'feat: Auto-detect magnetometer + barometer (#24)' (#27) from sl-firmware/mag-baro-detect into main
Merge pull request 'feat(bd-a2j): Sensor driver integration — RealSense D435i + RPLIDAR A1M8' (#17) from sl-perception/bd-a2j-sensor-drivers into main
Description
SaltyLab self-balancing bot firmware (STM32F722)
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