ACTIVATE when modeling DDD aggregates, value objects and domain logic using functional patterns — immutable records, curried operations, Result types, validation/enrichment pipelines, handler orchestration. ACTIVATE for 'aggregate', 'smart constructor', 'make*', 'validation pipeline', 'enrichment', 'domain handler' in a functional context. Provides cross-language functional DDD principles. For OOP-style DDD (classes, decorators, module-bounded contexts) see craft:ddd-principles. Companion examples: ddd-ts-fp.
