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* [UIO] implement ReadOnlyQuantizedVectors::preopen Schedule background prefetch of the quantization config, per-method metadata, quantized data and multivector offsets, wired into the segment's first_preopen for every dense vector with quantization configured. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * additional stage for quantized config preopen * better quantized preopening * Partially populate the first quantized vector in preopen The load reads the first vector off quantized.data (and off the first chunk in the chunked layout) to validate the stored vector size — on a cold open that was a round-trip. Use Populate::Partial (#9769) to prefetch exactly that prefix; the exact size comes from the quantized config the preopen already read. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * Restore the layout-probing quantized preopen Recovers the pre-rewrite design: preopen never reads the quantization config — it probes both layout candidates against the listing snapshot (a segment only contains the layout its real config selects), derives warmth from the segment-side quantization config (placement resolution incl. cached and low-memory), iterates storage types exhaustively for layout coverage, and schedules the config for open to parse once off the parked handle — no threading, no second preopen stage. Keeps the first-vector partial populate, with the size now derived from the segment config via construct_vector_parameters, and keeps VectorStorageType::is_pinned. Restores the full preopen test matrix and OneshotFile::preopen. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * review fixes --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com> Co-authored-by: Luis Cossío <luis.cossio@outlook.com>