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Support 4 embedding models (all-MiniLM-L6-v2, e5-small-v2, bge-small-en-v1.5, bge-base-en-v1.5) selectable via the SEDIMENT_EMBEDDING_MODEL env var. Add asymmetric query/document prefixes per model spec, dynamic embedding dimensions (384/768), and pinned SHA-256 hashes for all model artifacts. Benchmark results across 6 systems confirm all-MiniLM-L6-v2 remains the best default (tied with bge-base on quality, 2x faster).
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Summary
SEDIMENT_EMBEDDING_MODELenv var:all-MiniLM-L6-v2(default),e5-small-v2,bge-small-en-v1.5,bge-base-en-v1.5Test plan
cargo test— all 80 tests passcargo test -- --ignored— model download tests pass for all 4 variants