/**
 * Set the global proxy URL explicitly (from leaper.yaml config).
 */
export declare function setGlobalProxy(url: string | undefined): void;
/**
 * Get the effective proxy URL.
 * Priority: explicit > env > system auto-detect
 */
export declare function getProxyUrl(): string | undefined;
/**
 * Fetch with automatic proxy support.
 * Drop-in replacement for global fetch().
 * On first failure, auto-detects and uses system proxy.
 */
export declare function proxyFetch(url: string | URL, init?: RequestInit): Promise<Response>;
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