Function calculate_enhanced_spin_drift 

pub fn calculate_enhanced_spin_drift(
    bullet_mass: f64,
    velocity_mps: f64,
    twist_rate: f64,
    bullet_diameter: f64,
    bullet_length: f64,
    is_twist_right: bool,
    time_s: f64,
    air_density: f64,
    crosswind_mps: f64,
    pitch_rate_rad_s: f64,
    use_pitch_damping: bool,
) -> SpinDriftComponents

Calculate enhanced spin drift with all components.

DEPRECATED (MBA-1134): this in-integration acceleration model is no longer wired into any solver path — spin drift is now the single canonical empirical Litz post-process (litz_drift_meters, via effective_sg_from_inputs). Retained for backward compatibility and unit tests only. Do NOT reintroduce it into an integration loop alongside the Litz model, or lateral drift will be double-counted.