/**
 * Stable anonymous install id, used to tag every analytics event
 * (`AnalyticsEvent.machineId`) regardless of which Sapiom user is signed in.
 * Created once on first run and reused forever after.
 *
 * Hardened per `@sapiom/analytics-core`'s `identity.ts` pattern: private
 * file permissions (mode 0600, on both create and a pre-existing file),
 * silent regeneration when the stored content is missing/corrupt, and
 * graceful degradation — an unreadable/unwritable HOME must never crash
 * server boot over an analytics nicety. Kept as our own plain-text
 * `~/.sapiom/harness/machine-id` file for now; converging onto her
 * `~/.sapiom/analytics.json` identity is a separate, later conversation.
 *
 * @param filePath Where the id file lives. Defaults to the real
 *   `HARNESS_PATHS.machineId`; tests and scripted checks pass a path under
 *   their scratch state root so a boot never writes to the real home dir.
 */
export declare function getOrCreateMachineId(filePath?: string): Promise<string>;
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