Status: OUT
Visitor's bidirectionally-extensible stateful computation (accumulating results across elements, extensible along both type and operation axes) enriches the recursive subsystem's fully engineered infrastructure: the validated-and-governed subsystem provides the structural substrate (Composite trees, Iterator traversal, Chain routing, SOLID governance), and Visitor adds the computational layer (stateful cross-element accumulation within bidirectional OCP coverage).
Visitor adds bidirectional OCP-extensible computation to the recursive subsystem's validated infrastructure
Depends on (SL): visitor-recursive-computation-with-ocp-coverage, recursive-subsystem-validated-and-governed