Appendix I

Enterprise Reference Architecture

This appendix presents a vendor-neutral deployment blueprint for Constitutional Execution Infrastructure (CEI).

Users/AI
   ↓
API Gateway
   ↓
Runtime
   ↓
Decision Engine
   ↓
Immutable Ledger
  ↙      ↘
Replay  Projections

Reference Components

Component	Responsibility
Gateway	Authentication and routing.
Runtime	Governance orchestration.
Decision Engine	Authority, evidence, policy and admissibility evaluation.
Ledger	Immutable persistence.
Replay	Verification and reconstruction.
Projection	Operational read models.
Observability	Logs, metrics and traces.

Trust Boundaries

Client boundary
Governance runtime boundary
Persistence boundary
Administration boundary

Deployment Principles

Stateless runtime nodes
Replicated ledger
Independent replay workers
Horizontally scalable services
Portable APIs and policies

Operational Flows

Workflow	Flow
Execution	Gateway → Runtime → Ledger
Replay	Ledger → Replay → Report
Projection	Ledger → Replay → Projection
Policy Update	Repository → Runtime

Next: Appendix J — Standards Mapping, Bibliography & Index.

Engineering Evidence

Evidence and verification layer

This document forms part of the CEI publication record. Supporting evidence is organized through the engineering-evidence archive, specifications, architecture documentation and replay verification materials.

Evidence methodology Repository landscape CEI specification Replay verification Architecture map

Document: CEI_Book_Appendix_I_Enterprise_Reference_Architecture.html
Edition: First Public Edition
Version: 1.1