/**
 * Log a retrieval event to brain_retrieval_log for co-retrieval analysis.
 *
 * Creates the table on first use if it doesn't exist (self-healing).
 * Best-effort: errors are silently swallowed.
 *
 * @param projectRoot - Project root directory
 * @param query - The search query or fetch IDs
 * @param entryIds - Array of entry IDs returned in this retrieval
 * @param source - Retrieval source ('find', 'fetch', 'hybrid', 'timeline', 'budget')
 * @param tokensUsed - Estimated tokens consumed (optional)
 * @param sessionId - Session ID for grouping retrievals by session (optional, soft FK to tasks.db)
 */
export declare function logRetrieval(projectRoot: string, query: string, entryIds: string[], source: string, tokensUsed?: number, sessionId?: string): Promise<void>;
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