Add primary-only LeanVec storage kinds to C++ runtime#338
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Add two new StorageKind enum values for primary-only LeanVec: LeanVecLVQ4PrimaryOnly and LeanVecLVQ8PrimaryOnly. These select the new LeanDataset<UsingLVQ<N>, void, ...> partial specialization which omits the secondary (reranking) tier for ~50% memory savings at the cost of reranking accuracy. Vamana-only (IVF support out of scope). - api_defs.h: extend StorageKind enum - svs_runtime_utils.h: extend is_leanvec_storage(), add LeanDatasetPrimaryOnlyType alias, StorageType specializations, new dispatch cases in SVS_DISPATCH_STORAGE_KIND - vamana_index_impl.h, dynamic_vamana_index_leanvec_impl.h: new switch cases in dispatch_leanvec_storage_kind - runtime_test.cpp: write/read round-trip tests for both new kinds
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Summary
Adds the public C++ runtime surface for primary-only LeanVec. This is the public-side counterpart to the private re-architecture; see the private PR for the design discussion and rationale.
Changes
StorageKindenum: two new variantsLeanVecLVQ4PrimaryOnlyandLeanVecLVQ8PrimaryOnly.is_leanvec_storage(): updated to recognize them.LeanDatasetTypealias +StorageTypespecializations: produceLeanDataset<UsingLVQ<N>, void, ...>for the new kinds (mapping to the private partial specialization).StorageFactoryspecializations: build/load the primary-only LeanDataset (no secondary tier).SVS_DISPATCH_STORAGE_KINDmacro: add both new cases to the dispatch.Architectural alignment
The private side now uses a partial specialization
LeanDataset<T1, void, ...>(no runtime flag, no secondary member, no secondary methods) — mirroring how LVQ has separate one-level vs two-level classes. The public side exposes this through newStorageKindenum values, which is the same way LVQ4/LVQ8 variants are already exposed.Diff
+100 / −1 across 5 files. All additive at the public surface: no existing enum values changed, no existing API signatures changed.