/**
 * Provenance grading + Witnessed-State-Ratio (WSR) — pure scorer.
 *
 * Deterministic only — no LLM self-judgment. Grades each evidence item by its
 * collector trail, applies TTL decay for stale evidence, and computes:
 *
 *   WSR = W / (W + C + S)
 *
 * where W = witnessed mass, C = claimed mass, S = stale mass.
 *
 * Ship gate: shipGate='no-ship' when WSR < policy.wsrShipThreshold.
 */
import type { EvidenceItem } from '../../schemas/confidence.schema.js';
import type { ProvenanceGrade, ProvenanceInput, ProvenanceScore, WitnessRequirement } from '../../schemas/provenance.schema.js';
/** Numeric w_i ladder for provenance grades. */
export declare const GRADE_WEIGHTS: Record<ProvenanceGrade, number>;
/** Change-type → required witness taxonomy (witnessed-coverage). */
export declare const WITNESS_TAXONOMY: readonly WitnessRequirement[];
/**
 * Deterministic per-evidence provenance grade from collector metadata.
 * NO LLM — rules only.
 */
export declare function gradeEvidenceItem(item: EvidenceItem): ProvenanceGrade;
/**
 * Compute provenance score + WSR from an evidence bundle.
 *
 * Pure function — deterministic over the same input and reference time.
 */
export declare function computeProvenanceScore(input: ProvenanceInput, referenceTime?: string): ProvenanceScore;
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