/**
 * SMI-1445: GitHub App Authentication
 *
 * Provides GitHub App authentication for higher rate limits.
 * Extracted from github-client.ts for file size compliance.
 */
/**
 * Get GitHub App installation access token.
 * Returns cached token if valid, otherwise requests new one.
 */
export declare function getInstallationToken(): Promise<string | null>;
/**
 * Get GitHub API headers.
 * Tries GitHub App authentication first (5K req/hr), then falls back to PAT.
 */
export declare function getGitHubHeaders(): Promise<Record<string, string>>;
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