Function defaultScorer

Default face scorer combining surface type, normal alignment, centroid proximity, and area similarity.

Scoring breakdown:

• Surface type match: +1.0 (mismatch when both defined: -Infinity)
• Normal dot product: weighted contribution (rejected if < 0.707)
• Centroid distance: quadratic penalty (rejected if distSq > 100)
• Area ratio: penalized if |log(hintArea / faceArea)| > 1.0