/**
 * Importance Classifier — zero-LLM deterministic scoring for observations.
 *
 * Classifies every observation at store-time with:
 * - importance_score (0.0–1.0) based on type, keywords, entities, length
 * - significance flags (DECISION, ORIGIN, PIVOT, CORE, MILESTONE, PROBLEM)
 * - auto-pin for DECISION and MILESTONE flagged observations
 */
export type SignificanceFlag = 'DECISION' | 'ORIGIN' | 'PIVOT' | 'CORE' | 'MILESTONE' | 'PROBLEM';
export type CompressionTier = 'verbatim' | 'light' | 'medium' | 'distilled';
export interface ImportanceResult {
    score: number;
    flags: SignificanceFlag[];
    pinned: boolean;
}
/**
 * Classify an observation's importance. Pure, deterministic, zero-LLM.
 */
export declare function classifyImportance(content: string, type: string, metadata?: {
    entities?: string[];
}): ImportanceResult;
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