{"status":"ONLINE","service":"Meshmind Agent Engine","version":"0.1.0","architecture_tiers":["TẦNG 2: Privacy Shield (Presidio + De-anonymize Map)","TẦNG 3: Agent Orchestrator (FastAPI WebSocket + REST Proxy)","TẦNG 4: CausalDAG Memory Layer (NetworkX, PROV-O, Merkle)","TẦNG 5: BNB Greenfield Vault (AES-256-GCM + HKDF)"]}