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Tommaso Bianchi
b5ead4b29f
Port of snaporca e635627b81. Parity OK: 17 files identical, 8 diverging at their expected counts. The last reference an industrial sketcher offers that this one did not: Onshape's Use, SolidWorks' Convert Entities. Project already turned a body's 3D edges into 2D Lines, Circles and Arcs on a plane, but the result landed in its OWN feature, so while drawing in one sketch you could not borrow an existing body's edge and constrain to it. No new geometry code: Project's per-edge conversion loop is factored into project_edges_to_entities() and called from a second entry point that appends into an EXISTING sketch with construction = true. The loop appears once now, not twice. Construction is what makes it cheap and safe: SketchEngine already skips construction entities when building wires, so the references guide without being built, and being otherwise ordinary entities every constraint from this epic -- Collinear, EqualRadius, the axis-projected distances, PointOnLine, Symmetric -- works against them for free. Part of this refactors working code, so Project's behaviour identity is the invariant; the existing [CadDocument][project] cases guard it and a new case asserts a Project feature still emits construction == false. project_edges_into_sketch returns the number of entities appended, or -1 on a bad reference rather than throwing. VERIFICATION LIMIT, as with the previous four commits: this fork's kernel suite still cannot run (find_package(assimp) at configure time, snaporca-w80c). Shared sources are byte-identical to snaporca's, where kernel is 7700 assertions / 270 cases and ALL LADDERS HELD 7/7.