Status: IN
Double dispatch's completion of Visitor's extensibility mechanism (dual class hierarchy plus dispatch resolution) enables the governed recursive subsystem's operation extensibility: the recursive subsystem achieves its OCP-inverted axis specifically through double dispatch eliminating fragile type-switching, while the subsystem's governance (Interpreter validation plus SOLID constraint) ensures this extensibility is principled rather than ad hoc.
Double dispatch is the type-resolution mechanism enabling the recursive subsystem's governed extensibility
Depends on (SL): visitor-double-dispatch-mechanism, recursive-subsystem-validated-and-governed