Implements ROS2 IMU gyro + accel calibration node with: - Service-triggered calibration via /saltybot/calibrate_imu - Optional auto-calibration on startup (configurable) - Collects N stationary samples (default 100) - Computes mean bias offsets for gyro and accel - Publishes bias-corrected IMU on /imu/calibrated - Includes 10+ unit tests for calibration logic Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>