Merge commit 'd803bfe2b1fe7f5e219e50ac20d6801a0a58ac75' as 'vendor/ruvector'

vendor/ruvector/crates/rvf/rvf-index/README.md

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+# rvf-index
+
+Progressive HNSW indexing with tiered Layer A/B/C search for RuVector Format.
+
+## Overview
+
+`rvf-index` implements a Hierarchical Navigable Small World (HNSW) index optimized for the RVF storage model:
+
+- **Layer A** -- hot vectors, full-precision, in-memory graph
+- **Layer B** -- warm vectors, quantized, memory-mapped
+- **Layer C** -- cold vectors, compressed, on-disk with lazy loading
+- **Progressive build** -- index grows incrementally without full rebuilds
+
+## Usage
+
+```toml
+[dependencies]
+rvf-index = "0.1"
+```
+
+## Features
+
+- `std` (default) -- enable `std` support
+- `simd` -- enable SIMD-accelerated distance computations
+
+## License
+
+MIT OR Apache-2.0