032a050f7b51b27b6dfc4c38a83542b885289b30
A debounced `[ERR]` / `[WRN]` marker at the right edge of the input row, summarising — before submit — whether the current command would run. Backed by a small diagnostics-severity model: the walker emits severity- tagged diagnostics (parse outcome, schema-existence of table / column names) that the indicator summarises and the existing highlighting / hint layers detail. Advisory only — submission is never blocked. - docs/adr/0027-input-validity-indicator.md — the ADR. - docs/adr/README.md — index entry. - docs/requirements.md — new S6 (TUI shell).
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