fix(export): auto-union multi-part Scenes for STL (release) - #682
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Studio header STL on assemblies (e.g. keycap body + inlays) failed with export.no-shape asking for Scene.toUnion(). STL is a single mesh, so fuse world-frame parts automatically — same geometry as an explicit toUnion — while STEP/3MF/GLB keep per-part identity.
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Summary
Cherry-pick of #681 onto the protected
releaseline so kernelCAD-server can bump its vendor pin and Studio STL of multi-part assemblies (keycap, etc.) works in production.Test plan