Governance must be encoded at the execution boundary,
not documented after the fact.
In railway systems, a train cannot move until the interlock verifies track state, signal authority, and route integrity — simultaneously, at the point of actuation.
Most digital systems skip this step entirely. Decisions become irreversible actions with no state verification at the execution boundary.
"Zero Trust secures access.
Execution Boundary secures action."
Rail secures movement with interlocks.
Digital systems need an execution interlock.