This annex catalogs reusable architectural patterns for implementing Constitutional Execution Infrastructure (CEI). Each pattern addresses a recurring governance problem and can be adapted to different technologies and operational environments.
| Pattern | Intent | Typical Use |
|---|---|---|
| Authority Gateway | Validate authority before execution. | High-consequence operations. |
| Evidence-First Decision | Require sufficient evidence before evaluation. | Compliance and approvals. |
| Policy-as-Code | Externalize governance rules. | Versioned policy management. |
| Immutable Ledger | Record execution history permanently. | Audit and replay. |
| Replay Verification | Reconstruct historical execution. | Forensics and validation. |
| Projection Rebuild | Regenerate read models from events. | Recovery and synchronization. |
| Dual Authorization | Require multiple approvals. | Financial or safety-critical actions. |
| Controlled Override | Permit exceptional execution with explicit justification. | Emergency procedures. |
| Human-in-the-Loop | Insert human review before consequence. | AI-assisted workflows. |
| Federated Governance | Coordinate independent governance domains. | Multi-organization ecosystems. |
| Section | Description |
|---|---|
| Intent | What problem the pattern solves. |
| Context | When the pattern should be applied. |
| Structure | Key components and interactions. |
| Benefits | Operational advantages. |
| Trade-offs | Costs or limitations. |
| Related Patterns | Complementary governance patterns. |
The Governance Patterns Catalog provides a reusable vocabulary of implementation approaches, enabling architects to apply CEI principles consistently across different domains and technology stacks.
Next: Companion Annex Q — Anti-Patterns & Failure Modes.
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.