Create, review, or guide Domain Entity implementation in a TypeScript + DDD codebase. Use when: the request touches `*.entity.ts` files under `apps/api/src/<bc>/domain/entities/` or their tests under `apps/api/test/<bc>/domain/entities/`; modeling business rules with `Entity` from `@acme/shared` (dual API `create`/`tryCreate`, `Result` / `Result.combine` validation); validating FK refs with `Id.required` or own id with `Id.tryCreate`; enforcing enum-backed closed-set fields (status / kind / layout / provider / palette) from `@acme/<bc>-contracts` instead of string literals; validating nested entities or arrays element-by-element; adding state transitions via `cloneWith` (…
