/**
 * BrainAccessorImpl — concrete implementation of {@link BrainAccessor}.
 *
 * Delegates to the existing brain-retrieval module (observeBrain + searchBrainCompact)
 * but exposes a role-typed interface that UmbrellaDataAccessor.getSubAccessor
 * can return without coupling the call site to brain internals.
 *
 * @task T9188
 * @epic T9048
 * @see packages/contracts/src/sub-accessors.ts (BrainAccessor interface)
 * @see packages/core/src/memory/brain-retrieval.ts (underlying implementation)
 */
import type { BrainAccessor } from '@cleocode/contracts';
/**
 * Create a BrainAccessor for the given project root.
 *
 * All operations delegate to the canonical brain-retrieval module.
 * The accessor holds no DB handles directly — brain-retrieval manages
 * its own singleton connections.
 *
 * @param projectRoot - Project root (defaults to CWD resolution).
 * @returns A BrainAccessor instance.
 * @task T9188
 */
export declare function createBrainAccessor(projectRoot?: string): BrainAccessor;
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