/**
 * Wrapper around fetch() that automatically adds User-Agent header for LTI service requests.
 *
 * Canvas enforces User-Agent headers on all API requests starting January 2026.
 * This wrapper ensures compliance while allowing user override if needed.
 *
 * @param url - Request URL (string or URL object)
 * @param init - Fetch options (headers, method, body, etc.)
 * @returns Promise resolving to Response
 *
 * @see https://community.canvaslms.com/t5/Releases-Production/Canvas-Release-Notes-2026-01-17/ta-p/616001
 *
 * @example
 * ```typescript
 * const response = await ltiServiceFetch('https://api.example.com/scores', {
 *   method: 'POST',
 *   headers: { 'Content-Type': 'application/json' },
 *   body: JSON.stringify({ score: 95 })
 * });
 * */
export declare function ltiServiceFetch(url: string | URL, init?: RequestInit): Promise<Response>;
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