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feat(rectangles): add rectangle-lane maximal-rectangles engine

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Nests every part as the axis-aligned box of its material at its minimum-area
rotation and packs boxes with a maximal-rectangles free list (6 placement rules x
global/ordered pick). Sheet choice uses the salvage-credited look-ahead cost.

Curved extremes read the way the layout check sees them (circumscribed arcs on
the Clipper grid), so discs, rings and obrounds stay valid at box contact; an
80-job sweep failed 16-50 jobs before that rule.

Local 2026 production lanes (--min-salvage-dimension 12, --parallel 3):
- 91 all-rectangular jobs: 91/91 valid, cost 333081 vs best general 332153
  (Gpt6Astra, 89/91 valid), 5.9 s vs 13.7 s (Opus55) and 169.5 s (Gpt6Astra)
- 77 box-filling (>= 90%) jobs: 77/77 valid, lowest total cost 641637
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aj
2026-09-29 20:49:00 -04:00
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commit 13478f5102
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@@ -10,6 +10,7 @@ the OpenNest app or `OpenNest.Benchmark` build output.
| [Gpt6Astra](OpenNest.Engine.Gpt6Astra/) | Contact-based placement |
| [Opus55](OpenNest.Engine.Opus55/) | Frontier-advance no-fit-polygon packing |
| [Qwen38FlashNext](OpenNest.Engine.Qwen38FlashNext/) | Bottom-left greedy insertion over convex NFPs with an exact clearance gate |
| [Rectangles](OpenNest.Engine.Rectangles/) | Rectangle lane: maximal-rectangles box packing for plain and near-rectangular parts |
## Building