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Loads any .nest file (or folder of them) via NestReader and nests every drawing with quantity > 0 using each registered NestEngineBase, so it works sight-unseen against arbitrary real jobs without any hardcoded geometry. Optionally sweeps a fixed --sheet-sizes list instead of each file's own plate size. - BenchmarkJob/JobLoader build immutable job specs; a fresh Plate and NestItem list is created per (job, engine) run so state never leaks between engines or jobs. - NestValidator rejects a layout if any part falls outside the work area, any two parts are closer than PartSpacing (checked via each part's own world-space polygon inflated by the spacing, so it holds for arbitrary concave/holed geometry, not just bounding boxes), or a drawing gets more parts than requested. - Scoring matches Plate.Utilization() (placed area / full sheet area); ties among fully-placed layouts break on the smaller used bounding box (more usable remnant). - Report prints a per-job ranked breakdown plus a per-engine summary (wins, avg utilization, time), and can write a flat CSV. Verified end-to-end against a synthetic .nest file (not committed) against the four built-in engines; caught a genuine out-of-work-area bug in StripNestEngine in the process.