claude@clouddev1
cfd925c24a
New dml_target_column_diagnostics pass: an ERROR for an unknown column in the INSERT column list or the UPSERT DO UPDATE SET (validated directly against the insert_target_table). The INSERT target isn't a flat-scope `bindings` entry, so the existing schema-existence pass didn't cover these; a targeted pass avoids the false INSERT…SELECT ambiguity a global binding would cause. Closes the 3i cross-cut "schema-existence fires on INSERT VALUES" gate item, and closes the DA finding #12 (UPSERT DO UPDATE SET column now flagged like a top-level UPDATE's SET column). Residual: bare sql_expr_ident refs in the DO UPDATE SET RHS / WHERE remain unvalidated for upserts (the documented flat-scope limitation). Tests (+5): unknown INSERT column flagged + known silent; unknown DO UPDATE SET column flagged + known/excluded silent; predicate warning (= NULL) fires on a SQL UPDATE WHERE (cross-cut). 1596 pass / 0 fail / 1 ignored. Clippy clean.