Zhihuo RotoSpider Layout

RotoSpider Layout: check whether a set of rotational-molding molds can be mounted together on a machine arm/spider, using the real RotoSpider geometric layout engine (rotation envelope, dead height, mold-to-mold clearance, offset-arm risers, ring arrangements) - the engine behind https://www.rotospider.com/. Use `check_mold_layout` for any 'can these molds share an arm / which machine takes this mold / how many fit on the spider' question. Each mold is length_mm+width_mm+height_mm (box/frame), diameter_mm+height_mm (cylinder/tank), or an exact published shape with length_mm, width_mm, height_mm, geometry_asset_id, and geometry_asset_revision. The equivalent explicit *_in fields accept decimal inches. Never mix the _mm and _in alias for one value. Pass `machine` (public-sample straight-arm presets: VI-3-1500 (sample geometry), VI-3-2500 (sample geometry), Duroline (sample geometry), CS-10000 (sample geometry), CS-25000 (sample geometry)) or pass NO machine to scan all presets and learn