Add 2020 T-slot quick-swap sensor rail for SaltyLab/Rover/Tank variants: - sensor_rail.scad: 2020 T-slot profile, T-nut, thumbscrew, end cap, index pins, stem/post/tank clamp adapters - sensor_rail_brackets.scad: universal T-nut base + RPLIDAR A1M8, D435i, IMX219, UWB anchor, cable clip brackets (tool-free M3 thumbscrew retention) - sensor_rail_BOM.md: purchased hardware, print settings, export commands Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Description
SaltyLab self-balancing bot firmware (STM32F722)
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