Adds saltybot_bringup.launch.py with ordered startup groups (drivers→ perception→navigation→UI), timer-based health gates, configurable profiles (minimal/full/debug), and estop on Ctrl-C shutdown. Also adds launch_profiles.py dataclass module and 53-test coverage for profile hierarchy, timing gates, safety bounds, and to_dict serialization. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Description
SaltyLab self-balancing bot firmware (STM32F722)
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