Consolidated two stateless classes into one unified API: Dxf.Import(),
Dxf.GetGeometry(), Dxf.ExportPlate(), Dxf.ExportProgram(). Export
state moved into a private ExportContext. Removed bool+out pattern
from GetGeometry in favor of returning empty list on failure.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Stateless orchestrator that takes a NestRequest and returns a NestResponse.
Imports DXFs, builds NestItems, runs the engine in a multi-plate loop until
all parts are placed, computes timing, and returns utilization metrics.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
