/**
 * Validates the structural integrity of a workflow flow (array of nodes).
 *
 * Throws an `Error` with a human-readable message on the first violation found.
 *
 * Checks performed:
 *  1. Every node has a non-empty string `id`
 *  2. Node IDs are unique within the flow
 *  3. Every node `type` is a recognized workflow node type
 *  4. Per-type required fields:
 *       - custom-model → modelId
 *       - workflow     → workflowId
 *       - logic        → logicType
 *       - for-each     → loopBodyNodeIds (non-empty) OR count (>0)
 *  5. Cross-references all point to node IDs that exist in the flow:
 *       - dependsOn entries
 *       - input ref.node (excluding "workflow" which is a reserved keyword)
 *       - input ref.conditional entries
 *       - loopBodyNodeIds entries
 */
export declare function validateWorkflowFlow(flow: unknown[]): void;
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