/** change: add-retrieval-match-evidence */
export declare const LEXICAL_MATCH_FIELDS: readonly ["symbol", "path", "signature", "doc", "body"];
export type LexicalMatchField = (typeof LEXICAL_MATCH_FIELDS)[number];
export type MatchField = LexicalMatchField | 'vector';
export type RetrievalTier = 1 | 2 | 3;
export interface MatchEvidence {
    field: MatchField;
    terms: string[];
    tier: RetrievalTier;
}
export type SearchableFields = Partial<Record<LexicalMatchField, string>>;
export type FieldTermFrequencies = Partial<Record<LexicalMatchField, Map<string, number>>>;
export declare function vectorMatchEvidence(tier: 2 | 3): MatchEvidence;
/** Fail closed if a retriever violates the additive evidence contract. */
export declare function requireMatchEvidence(evidence: MatchEvidence | undefined): MatchEvidence;
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