Read raw column metadata through the built-in PRAGMA in the private empty temp schema. Validate bytes before names become SQL identifiers, and select inventory subsets by exact encoded identity so unrelated malformed names cannot alias valid columns.
Validation: 5 focused identity controls; 15 selected producer/provider controls (33 skipped); public CLI baseline collision, fixed format refusal and valid-subset success; check:fast and docs:check. Generated inert SQLite fixtures on macOS arm64 with Node 24.18.0; no Windows qualification or large-file/stress workload.
Refs #4710
morluto
748ac7f0df