Function calculate_atmosphere 

pub fn calculate_atmosphere(
    altitude_m: f64,
    temp_override_c: Option<f64>,
    press_override_hpa: Option<f64>,
    humidity_percent: f64,
) -> (f64, f64)

Enhanced atmospheric calculation with ICAO Standard Atmosphere.

Arguments

• altitude_m - Altitude in meters
• temp_override_c - Temperature override in Celsius (None for standard)
• press_override_hpa - Pressure override in hPa (None for standard)
• humidity_percent - Humidity percentage (0-100)

Returns

Tuple of (air_density_kg_m3, speed_of_sound_mps)