feat: add candidate FreeCAD naming SDK and attachment oracles

Build and verify the candidate-only FreeCAD naming bridge and OCCT worker path, including three-stage StringHasher restoration. Add Datum, ShapeBinder, attachment-mode, and PartDesign structure oracles plus offline SDK build plans and CI boundary checks.

native/freecad-naming-probe/shims/FCConfig.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#include <map>
+
+#ifndef AppExport
+#define AppExport
+#endif
+
+#ifndef BaseExport
+#define BaseExport
+#endif