pub fn mutate(g: &Genome<'_>, seed: &mut u64, strength: f32)Expand description
Mutate a single gene slot. strength in [0, 1]:
0.0 → no-op,
0.3 → gentle drift (default),
1.0 → wild.
Freq snaps to the closest golden-pentatonic note around its current value so the voice never strays into clashing intervals.