Status: OUT
The recursive structure subsystem achieves both completeness (infrastructure for traversal, sharing, and operations via Composite/Iterator/Flyweight/Visitor) and safety (uniform leaf-composite treatment without runtime type errors), making hierarchical designs fully reliable.
Completeness and OCP coverage would guarantee safe recursive designs if the transparency-safety tension were resolved
Depends on (SL): recursive-structure-complete-infrastructure, composite-visitor-dual-ocp-coverage