- Add chassis_node to pipeline table and startup instructions
- Fix laser topic from /gimbal/mode to /laser/command
- Add chassis mode switch and PID tuning sections
- Fix gimbal PID field names to match API.md (visual_*/angle_*)
- Fix gimbal baud rate to 921600 in troubleshooting
- camera_node (driver_pkg): Hikrobot MvCamera SDK image capture
- vision_node (algorithm_pkg): Otsu threshold + contour detection + target tracking
- web_node (application_pkg): HTTP server with MJPEG preview and mode switch API
- gimbal_node (gimbal_control_pkg): UART serial communication per gimbal protocol
- bringup_pkg: launch file for full pipeline
- config: nginx reverse-proxy for MJPEG streaming and API routing