Two new engine classes subclassing DefaultNestEngine that override
CreateComparer, PreferredDirection, and BuildAngles to optimize for
preserving side remnants. Both registered in NestEngineRegistry and
covered by 6 integration tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add Optimize method that re-places parts using NFP-based BLF, keeping
the result only if it improves density without losing parts. Fix
perimeter inflation to use correct offset side. Add NfpNestEngine
that wraps AutoNester for the registry. Register NFP engine.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
