bherbruck f300449cf7 surface.cone_p2: port offsets, cone recognition, STEP rebuild, ellipse trim intervals ...

Ports SmCone::CreateOffsetSurface, SmCone::IsNurbSurfaceCone,
SmCone::RebuildSTEPFromNURBParameters and sm_GetEllipseTrimIntervals into
surface::cone::p2, with the C++ shim (verbatim copy of the file-static trim
helper), FFI binding, difftest runner and fixtures. Wires the
UNPORTED(surface.cone_p2) stubs in surface::cone::p3 and
BSplineSurface::copy_and_add_analytics (which now takes the kernel).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BY8UpXKuMci15rAWGXsbsm

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..

shim

surface.cone_p2: port offsets, cone recognition, STEP rebuild, ellipse trim intervals

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stubs

harness/cpp: per-test SM_API driver; plan/baseline.md C++ baseline

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build.sh

harness/cpp: key the CMake build dir by source tree

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CMakeLists.txt

harness/cpp: per-test SM_API driver; plan/baseline.md C++ baseline

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run_tests.sh

harness/cpp: per-test SM_API driver; plan/baseline.md C++ baseline

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