test: add an in-memory SQLite oracle over the same fixtures - #52
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Loads the catalog and its CSV rows into an in-memory SQLite database so the same query can be answered by a reference implementation. Empty CSV fields stay NULL rather than becoming zero values, and
Catalog.Tables()returns tables sorted by name so loading is deterministic.modernc.org/sqliteis pure Go (no CGO) and is imported only frominternal/difftest, which nothing outside its own tests imports —go list -deps ./cmd/minisqlcontains no SQLite driver.Note: the driver requires Go 1.25, so the module now declares
go 1.25.0(previously 1.22). An older driver release would have kept 1.22, but its transitive dependencies pull the requirement back up regardless, so pinning the whole tree would be brittle for little gain.Closes #44