01Hierarchical Role-Based Access Control (RBAC) with role inheritance
02Multi-agent architecture for secure retrieval, reranking, answering, and verification
03Document classification (public, internal, confidential) with tag-based filtering
04Audit-ready system with citations and logs for compliance (e.g., NIST SP 800-53 AU-2)
05Multi-tenant support and step-up authentication for elevated confidential access
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