/**
 * Validate the polymorphic `content` relationship reference against the model
 * registry. The DTO can only assert that `type` is a non-empty string —
 * BOUND_TO accepts any registered model, and the registry is the only place
 * that knows the full set.
 *
 * Shared by `AssistantController` and `OperatorController`: both POST routes
 * take the same `AssistantPostDto` and must bind the created thread to the
 * scope the client sent, with identical validation and error text. It lives
 * here rather than as a private method on one controller so the two engines
 * cannot drift apart again (the operator route silently dropped the binding,
 * which created records outside the caller's scope).
 */
export declare function resolveBoundContent(reference?: {
    type: string;
    id: string;
}): {
    type: string;
    id: string;
} | undefined;
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