Status: OUT
Builder-Visitor's bidirectional functional duality (Builder analyzing without creating, Visitor creating during traversal) validates construction-computation permeability, while the recursive subsystem's bidirectional engineering (NullIterator-enabled forward traversal + Chain-of-Responsibility backward routing) provides the structural substrate for Visitor's traversal — the permeability validation is structurally grounded in the recursive infrastructure, but only while Visitor's encapsulation-breaking tendency does not undermine the element classes' integrity.
Construction-computation permeability is grounded in recursive infrastructure, contingent on Visitor not compromising element encapsulation
Depends on (SL): builder-visitor-duality-validates-construction-computation-permeability, recursive-subsystem-bidirectionally-engineered
Unless: gof-visitor-breaks-encapsulation