[lore 4/7] VectorStore interface + sqlite-backed reference impl#4
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Adds pkg/lore/vector with VectorStore interface (Upsert/Delete/Search/Close), Hit and SearchOpts types, and pkg/lore/vector/sqlitevec: a pure-Go SQLite-backed impl using BLOB columns + cosine similarity computed in Go (Path A, no CGO). Includes schema DDL (vectors table), OTel spans on all write/read paths, full test coverage (dimension mismatch, top-K ranking, limit, delete, upsert replace, close idempotence), and README usage example. go.mod: adds go.opentelemetry.io/otel + trace v1.43.0, modernc.org/sqlite v1.50.0.
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Summary
pkg/lore/vectorwith theVectorStoreinterface (Upsert,Delete,Search,Close), plusHitandSearchOptstypes and sentinel errors (ErrNotFound,ErrInvalidArgument,ErrClosed).pkg/lore/vector/sqlitevec: a pure-Go SQLite-backed reference impl. Vectors stored as little-endian float32 BLOBs; cosine similarity computed in Go over a full table scan (Path A, zero CGO, zero extensions). Acceptable at v0.1.1 scale; 100K scale limit documented in godoc.schema.go(vectorstable withentry_id,dim,vec,updated_at).lore.vector.upsert,lore.vector.delete,lore.vector.searchwithlore.id,lore.dim,lore.limit,lore.candidatesattributes.go.opentelemetry.io/otel+tracev1.43.0,modernc.org/sqlitev1.50.0.Test plan
go build ./...passesgo vet ./...passesgo test -race ./pkg/lore/vector/...passes (10/10 tests)gofmt -l ./pkg/lore/vector/reports no filesPart of lore v0.1.1 build campaign (QUEST-308, parallel with Q2/Q3/Q6).