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/App/DocumentObject.h

@@ -0,0 +1,31 @@
+#ifndef SRC_APP_DOCUMENTOBJECT_H_
+#define SRC_APP_DOCUMENTOBJECT_H_
+
+#include <string>
+
+namespace App {
+
+class DocumentObject
+{
+public:
+    explicit DocumentObject(long id = 0)
+        : objectId(id)
+    {}
+
+    long getID() const
+    {
+        return objectId;
+    }
+
+    std::string getFullName() const
+    {
+        return "ProbeObject";
+    }
+
+private:
+    long objectId;
+};
+
+}  // namespace App
+
+#endif