/**
 * Branch summarization helpers — ADR 0010 D3.
 */
import type { AgentMessage, UserMessage } from '../llm/types/agent-message.js';
import type { AgentMessageRow } from './agent-db-models.js';
export declare const BRANCH_SUMMARY_PREFIX = "[Alternate branch summary]\n";
/** Rows abandoned when switching active_leaf from oldLeaf to newLeaf. */
export declare function collectAbandonedPathRows(allRows: AgentMessageRow[], oldLeafId: number | null | undefined, newLeafId: number): AgentMessageRow[];
export declare function abandonedRowsToMessages(rows: AgentMessageRow[]): AgentMessage[];
export declare function branchSummaryAsUserMessage(summary: string, createdAt?: number): UserMessage;
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