The previous fix (e10841a6c8) passed {"__file__": ...} as the globals
argument to exec(), which replaced the caller's globals dict entirely.
This stripped FreeCAD, FreeCADGui, Workbench, and other names that
modules expect to be available, causing NameError failures across
Material, Tux, Mesh, ReverseEngineering, OpenSCAD, Inspection, Robot,
AddonManager, MeshPart, and others.
Fix by merging __file__ into the caller's globals with
{**globals(), "__file__": str(init_py)} so both __file__ and all
existing names remain available in the executed code.
