Constitutional multi-agent decision architecture for major programme governance. 16 agents across 4 layers (Programme Cognitive Chair, 7 Strategic Domain agents, 5 Cross-Domain Coupling agents, 3 Adversarial Governance agents) grounded in Oxford MMPM doctrine. Supports 6 operating modes: Tutor (doctrine explanation), Analyst (focused domain analysis), Council (full multi-agent deliberation), Exploration (structured scenario analysis), Research (academic support), and Brief (executive summaries). Features constitutional principles with operational checks, evidence quality gates, dissent preservation, confidence aggregation, and mandatory adversarial review for high-stakes decisions.