Positive schema entropy rate condition. Operationalized as quarterly increase in corroboration signals, parametric recall, and citation coverage. Achieved through continuous maintenance above cognitive equilibrium threshold. Test quarterly using schema entropy rate calculation. Defended posture enables compounding: this quarter’s gains strengthen foundation for next quarter. Not permanent — requires ongoing maintenance. Most common failure: assuming defended posture is terminal state, reducing maintenance, forfeiting to contested. Track per-perimeter (can be defended on identity, contested on domain simultaneously).