MarvisX: An Agent-Native Company Brain with Cross-Project Knowledge Graph and Brain Reflection

MarvisX — Architectural Description Architectural description of MarvisX, an agent-native company-brain system deployed in production since 2025-Q4. Six contributions C1 — a 16-edge cross-project Knowledge Graph C2 — a foreign-key-immutable audit log satisfying EU AI Act Article 12 logging C3 — a five-layer Brain reflection pipeline with a Direction-Aware closed loop C4 — a five-form knowledge taxonomy C5 — a five-rule Constitution enforced by deterministic hook gates C6 — an agent-native Model Context Protocol (MCP) surface exposing 91 tools Comparison against 25 contemporary systems on 9 dimensions. Licensing Released for prior-art and defensive-publication purposes under CC-BY 4.0; codebase under BSL 1.1 with 4-year change date to Apache 2.0.