/**
 * Instance ID generator (spec §3.5, AC-4.56).
 *
 * Format: fr-<project-slug>-<yyyyMMdd>-<seq>
 * Example: fr-sevo-20260420-001
 *
 * The sequence number is derived from existing instances for the same
 * project+date combination, ensuring uniqueness within a single day.
 */
import type { PipelineInstance } from '../types/index.js';
/**
 * Generate a Pipeline Instance ID.
 *
 * @param projectSlug - The project slug (e.g. "sevo").
 * @param existingInstances - All known instances for conflict-free seq.
 * @param now - Optional date override for testing.
 */
export declare function generateInstanceId(projectSlug: string, existingInstances: ReadonlyArray<Pick<PipelineInstance, 'instanceId'>>, now?: Date): string;
/** Validate that an instance ID matches the spec format. */
export declare function isValidInstanceId(id: string): boolean;
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