Status: OUT
Composite-Visitor's bidirectional OCP coverage (new types via Composite, new operations via Visitor) achieves full bidirectional extensibility for recursive structures only when the element class structure is stable — if structure changes frequently, the Visitor axis collapses (all visitors need updating) and only standard Composite OCP remains.
Bidirectional OCP is conditional on structural stability; the strong claim propagates to 6 downstream conclusions that implicitly assume stability
Depends on (SL): composite-visitor-dual-ocp-coverage