A.16.0:13.3 - Operator trajectory with retirement

An operator alert note about a service disturbance may move:

notice -> stabilize -> route -> projection -> operationalize

If later evidence no longer supports one route, the admissible continuation may include explicit retirement of that branch rather than silent disappearance. The retirement does not erase the prior branch; it ends the retired branch’s current use and preserves continuity explicitly. Any authority change still requires the separate relation in §4.6.