/**
 * Observe Step — ported from KB sleep/steps/observe.ts.
 *
 * Extracts structured facts from recent chat memories and stores them.
 * This is the sleep-path version of ingest.extractFacts:
 * - Finds recently ingested chat memories that haven't been fact-extracted yet
 * - LLM extracts facts (content, category, confidence, entities)
 * - Each valid fact is stored via deps.structured.storeFact
 *
 * Adapter note: KB's observe step targets the facts table via ensureFactsTable
 * and storeFact from fact-store.ts. Arcana uses deps.structured.storeFact.
 * The extraction prompt is ported verbatim from KB fact-extractor.ts:20-31
 * (FACT_EXTRACTION_PROMPT, also used in Arcana's ingest.extractFacts).
 */
import type { MaintainDeps } from '../index.js';
import type { SleepConfig } from '../config.js';
export interface ObserveResult {
    count: number;
    processed: number;
    errors?: string[];
}
export declare function runObserveConversations(deps: MaintainDeps, config: SleepConfig): Promise<ObserveResult>;
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