Function law_effect_number

pub fn law_effect_number(
    level_one_value: i64,
    level: i64,
    amplification: f64,
) -> i64

The number an effect (or a passive modifier) actually lands with: the authored value, grown by the law’s upgrade level, then multiplied by the bridge amplification.

This is the ONE function that applies amplification. Resonance and every condition parameter deliberately never pass through here — that separation is what makes acceptance #8 structural instead of a rule someone has to remember.