docs: add Flat and DiskANN benchmarks with index selection - #90
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The benchmark dashboard now compares HNSW, Flat, and DiskANN through an Index selector between Dataset and Test configuration, with HNSW selected by default. Switching the index updates all six charts, configuration labels, page titles, and SVG exports. Memory chart axes display MB/GB units.
Add measured xvec/zvec Flat results for INT4, INT8, FP16, and unquantized FP32, the missing HNSW FP32 pair, and four DiskANN runs covering only FP16 and FP32. Flat INT4/INT8 use a local zvec-go v0.7.0 modification to enable native rotation, recorded as
v0.7.0+rotate. DiskANN uses the unmodified v0.7.0 backend, with degree 100, construction list 50, PQ chunks 64, query list 300, and rotation/refinement disabled. FP32 means no scalar quantization; DiskANN still uses internal PQ for traversal.The parser validates index-specific parameters and keeps incompatible configurations separate. DiskANN results match the original JSON reports and process resource measurements. In this workload, concurrent QPS is 318.86/375.52 for xvec FP16/FP32 and 8.03/8.03 for zvec; Recall@100 ranges from 87.281% to 87.491%.
Validation: 18 tests pass; Astro/TypeScript reports no diagnostics; production build succeeds. Chromium checks cover the HNSW default, all three index choices, FP16/FP32-only DiskANN categories, six charts, SVG exports, MB/GB axes, switching back to other indexes, and mobile layout. Earlier checks also cover configuration deep links. No browser runtime errors were observed.