Function spawn_wave

pub fn spawn_wave(
    sink: &mut dyn FightSink,
    rng: &GameRng,
    config: &GameConfig,
    lookups: &ContentLookups,
    fight: &ActiveFight,
    fight_data: &WaveFightData,
    base_power: f64,
    current_chapter: i64,
    fight_type: &str,
) -> Result<(), Error>

Native: the prepare_fight interpreter. Computes normalised enemy stats from the chapter power curve + the typed wave blob, then emits spawn events for the current wave. RNG is consumed once per spawned enemy (the spawn-entity uuid), in iteration order — identical to the original. fight supplies current_wave + the live entities (for the multi-wave x-offset).