Governance non-traversability applies the framework’s idea of traversability — the ability to move from where an ecology is to where it needs to be — to governance itself. It marks the moment the governed can route around every lever of public constraint: the systems may still obey their operators, and technical control may be intact, but no one outside can any longer reach the operators to correct their course. Because it precedes the catastrophic loss of control rather than coinciding with it, it is a pre-irreversibility threshold — the kind the irreversibility register exists to catch while turning back is still possible.