feat: add chord-height curve tessellation with open-time circleSides

[mlightcad]

Summary

• Add chord-height tessellate() for arcs, ellipses, splines, polylines, loops, and areas so short curves use fewer vertices than the old fixed getPoints(100) path.
• Honor an open-time circleSides option on the database (draft 50 by default) instead of AutoCAD VIEWRES, which is commonly stored as 1000 and would inflate GPU memory and HTML export size.
• Thread the same tessellation options through entity drawing (Polyline, Spline, Leader, 2dPolyline) and document that renderer circularArc / ellipticalArc / area implementations should use acdbDrawTessellateOptions.

Test plan

• npx jest for AcGeCurveTessellate, AcDbDrawTessellate, AcDbPolyline, AcDbSpline, AcDbLeader
• Related geometry-engine specs (AcGeCircArc2d/3d, AcGeEllipseArc3d, AcGeSpline3d, AcGePolyline2d, AcGeArea2d, AcGeLoop2d)
• Open a drawing with many arcs/circles at draft (50), standard (100), and high (1000) and compare smoothness vs memory
• Confirm a DWG whose VPORT circleSides is 1000 still draws at draft unless circleSides is passed at open time
• Downstream cad-viewer: Three.js and SVG renderers tessellate via acdbDrawTessellateOptions; example FileUpload curve-quality preset is wired through