//! Storage backends: vector index (HNSW) + temporal knowledge graph (SQLite).
//!
//! Why: Two complementary data shapes — dense vectors for semantic recall and
//! triples-with-time for relational facts — covered by separate modules so each
//! can evolve independently.
//! What: Re-exports `VectorStore` trait and `KnowledgeGraph` type.
//! Test: See submodule tests.
pub use ;
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