docs: reflect HNSW vector index in schema + prerequisites#8
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Update the documents schema snippet in HYBRID_SEARCH.md to use the HNSW index (with a note on why ivfflat's default probes=1 tanked recall) and note the pgvector >= 0.5.0 requirement in the README prerequisites. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Follow-up to the HNSW index fix (#7), which lifted live claim verification from ~46% to 94% (17/18).
Updates the docs to match the new index:
docs/HYBRID_SEARCH.md— thedocumentsschema snippet now createsdocuments_embedding_hnsw_idx USING hnsw (...)instead ofivfflat, with a short note on why (ivfflat's defaultprobes=1scanned ~1% of rows and missed the true nearest neighbor, causing 0%-confidence claims).README.md— prerequisites note pgvector >= 0.5.0 (required for HNSW).No code or data changes.
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