/**
 * HyDE — Hypothetical Document Embeddings for code search.
 *
 * Instead of embedding the raw query ("how does auth work?"), we ask the LLM
 * to write a short hypothetical card that would answer the question, then
 * embed THAT. The resulting vector is much closer to real card vectors because
 * it uses the same vocabulary (class names, file roles, technical patterns).
 *
 * BM25 always uses the original query. HyDE only affects the semantic leg.
 *
 * References: Gao et al. 2022, "Precise Zero-Shot Dense Retrieval without
 * Relevance Labels" — arXiv:2212.10496
 */
/**
 * Generates a hypothetical card for the query and returns its embedding.
 * Returns null if HyDE should be skipped, LLM is unavailable, or times out.
 */
export declare function hydeEmbed(query: string): Promise<Float32Array | null>;
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