Truncated & Broken Mechanical CAD .STEP (ISO 10303-21) Entity-Graph & Solid-Body Salvager

Deterministic ISO 10303-21 STEP Clear-Text Encoding entity-reference directed-graph builder + disconnected subgraph isolator per 'MANIFOLD_SOLID_BREP'/'ADVANCED_BREP_SHAPE_REPRESENTATION' + NURBS knot-vector sanity checker engine (.step, .stp, .iges, .igs) built for SolidWorks, Autodesk Fusion, FreeCAD, Siemens NX — zero-upload ephemeral Wasm RAM execution.

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