docs: densify customer architecture datasheet

docs/NEXUS_ONE_AI_ENTERPRISE_DATASHEET_SOURCE.md

@@ -16,6 +16,16 @@ development and operational controls into one managed platform.
 - Operate AI with health monitoring, logs, audit, backup and lifecycle controls.
 - Support connected, restricted-network and air-gapped deployment patterns.
 
+## Platform design principles
+
+- Customer-authoritative identity, data, infrastructure, models and operating policy.
+- Durable business and execution state independent of queues and worker processes.
+- Least-privilege access for users, services, applications and integrations.
+- Replaceable inference through a logical model gateway.
+- Truthful degraded and failure states instead of simulated success.
+- Versioned, reviewable and recoverable applications, packs and platform changes.
+- Signed offline delivery for approved releases, models and capability packs.
+
 ## Reference architecture
 
 Users access a single TLS origin and authenticate through enterprise identity.