/**
 * `User-Agent` header value sent on all outbound requests, per
 * Service Development Standards §4.4.
 *
 * Format: `axe-auth/v<package-version>` (e.g. `axe-auth/v1.0.2`).
 *
 * The npm scope (`@deque/`) is deliberately omitted from the wire format:
 * `@` and `/` are not valid `tchar` per RFC 9110 §5.6.2, so a token like
 * `@deque/axe-auth` would make the User-Agent malformed and risk WAF
 * rejection (e.g. OWASP CRS rule 920330).
 */
export declare const USER_AGENT: string;