/**
 * POST `/endpoint_security/startup/` with `metadata.user_profile` so `EndpointMachine.user_profile`
 * stays fresh even when `log_uuid` is throttled (e.g. customer hooks with existing auth_key.txt).
 * Signs `payload` with the stored machine key when present (same as `log-llm-config` startup_sender)
 * so the backend does not revoke keys on every unsigned sync.
 *
 * Throttled (default 30 min) on success to avoid an extra HTTP round-trip on every tool call.
 * After failures (network, non-2xx, etc.), exponential backoff caps repeated work so hooks are
 * not blocked on every batch. Override interval with `OPTIMUS_STARTUP_SYNC_INTERVAL_MS` (set to
 * `0` to sync on every batch when healthy). Skip entirely with `OPTIMUS_SKIP_STARTUP_SYNC=1`.
 */
export declare function ensureStartupMetadataSynced(hardwareUuid: string): Promise<void>;
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