a3268495e2
Sweep: input_verdict tests confirm the schema-existence check fires across the identifier-taking commands — unknown table on drop / show / add column, unknown column on drop column / update — and that known references stay clean. The Step B check is grammar-generic, so this is verification + coverage rather than new code. Docs: requirements.md S6 -> [x], baseline 1096; CLAUDE.md deferred list reconciled (C5a and S6 are done — removed); ADR-0026's as-built note updated (step 5 shipped via ADR-0027); ADR-0027 gains an As-built notes section recording the post-walk diagnostics realization, the pre-rendered message, the timeout-based debounce, coarse WARNING spans, and the deferred highlight/hint wiring.