Computes per-point crowding distance over a single Pareto front (spec
§9.6):
- Returns Vec<f64> with the same length as the front index slice.
- Empty front → empty Vec.
- Front of length ≤ 2 → all f64::INFINITY.
- Boundary points along each objective receive INFINITY.
- Interior points get sum of normalized neighbor gaps; if max == min for
an objective the contribution is zero.
- Operates on minimization-oriented objective values.
swaits
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