/**
 * Validate an `appName` slug at SDK boundary points (the `AugustSDK`
 * constructor and the standalone {@link initializeSentry} entry point).
 *
 * Rules (kept intentionally narrow so the value is safe to use as a Sentry
 * tag, an HTTP header value, and a filesystem-safe identifier — this is
 * why we accept slugs only, not display names):
 *  - non-empty after trim
 *  - 3..64 characters
 *  - only `[a-zA-Z0-9._-]`
 *  - not shaped like an EVM address (`0x` + 40 hex chars) — an address
 *    passes the character rules but is a high-cardinality wallet
 *    identifier, not an application name. This also catches callers of
 *    `initializeSentry` still passing the pre-v9 positional argument
 *    order, where a wallet address occupied the slot `appName` now holds.
 *
 * Throws a descriptive `AugustValidationError` (code `INVALID_INPUT`) that
 * names the failed rule and includes a remediation hint pointing at the
 * docs link.
 *
 * @param value - The candidate app name, as received from the caller.
 * @returns The trimmed, validated slug.
 * @throws AugustValidationError when the value is missing, empty,
 *   mis-typed, out of the 3–64 length range, contains disallowed
 *   characters, or is shaped like an EVM address.
 */
export declare function validateAppName(value: unknown): string;