/**
 * Finds an available TCP port starting from startPort.
 * A port is considered available only if:
 *   1. We can bind to it (no process owns it on 0.0.0.0 / ::)
 *   2. Nothing is already accepting connections on 127.0.0.1 or ::1
 *      (catches servers bound to ::1 that don't block an IPv4 bind)
 *
 * Throws if no free port is found before MAX_PORT (65535).
 */
export declare function findAvailablePort(startPort: number): Promise<number>;
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