Thin-framed, hollow, or concave parts (e.g. SULLYS-035's frame) have
inherently low part-to-bbox utilization yet nest tightly, so the 30%
MinUtilization floor wrongly dropped every candidate for them. Pair
quality is judged by the rotated pair bounding-box area the results
are already sorted on; utilization now only ever serves as the
high-aspect exception (UtilizationOverride), never as a rejection.
Adds a hollow-frame helper plus regression tests that kept pairs
exist with low utilization and results stay sorted by pair area.
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