/**
 * BRAIN Timeline — Layer 2 retrieval: chronological context around an anchor entry.
 *
 * @task T5132
 * @epic T5149
 */
import type { TimelineBrainParams, TimelineBrainResult } from '@cleocode/contracts';
/**
 * Determine the entry type from its ID prefix.
 *
 * Conventions:
 * - D... -> decision (D001, D-xxx)
 * - P... -> pattern  (P001, P-xxx)
 * - L... -> learning (L001, L-xxx)
 * - O... or CM-... -> observation (O-xxx, CM-xxx)
 */
export declare function parseIdPrefix(id: string): 'decision' | 'pattern' | 'learning' | 'observation' | null;
/**
 * Get chronological context around an anchor entry.
 * Fetches the anchor's full data, then queries all 4 BRAIN tables
 * via UNION ALL to find chronological neighbors.
 *
 * @param projectRoot - Project root directory
 * @param params - Timeline parameters with anchor ID and depth
 * @returns Anchor entry data with surrounding chronological entries
 */
export declare function timelineBrain(projectRoot: string, params: TimelineBrainParams): Promise<TimelineBrainResult>;
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