Function compass_bearing_to_shooter_relative_deg 

pub fn compass_bearing_to_shooter_relative_deg(
    bearing_deg: f64,
    shot_azimuth_deg: f64,
) -> f64

Earth-fixed compass bearing (degrees, 0 = north) -> shooter-relative wind-FROM degrees against the shot azimuth (MBA-1368), normalized to [0, 360). A wind FROM north (bearing 0) with the shot fired due north (azimuth 0) is a pure headwind (relative 0 — the 0.19.0 sign convention); a bearing 90 (from east) on a northbound shot is wind from the shooter’s RIGHT (relative 90).