claude@clouddev1
c20c6e05ca
Closes the two diagnostics deferred by sub-phase 2d that were not attached to a user-approved deferral. `cte_arity_mismatch` stays deferred — it depends on the §10.3 stage-2 CTE harvest, which IS a user-approved deferral. - `diagnostic.projection_alias_misplaced` (ADR-0032 §11.2): emitted when a projection alias is referenced from `WHERE` / `HAVING` / `GROUP BY`. `ORDER BY` references are allowed and silent. The pass is integrated into `schema_existence_diagnostics`: when a bare-column ref doesn't resolve to any binding's column but DOES match a projection alias in the current SELECT leg, the new diagnostic pre-empts the misleading `unknown_column` that would otherwise fire on the same span. Real-column-shadowed-by-alias cases (engine resolves to the table column) stay silent. Subquery scopes (paren depth > 0) keep their own implicit alias bag — outer aliases don't leak into inner WHERE. - `diagnostic.compound_arity_mismatch` (ADR-0032 §11.2 / §11.7): a new MatchedPath-walking pass that counts projection items per SELECT leg by tallying top-level commas at the leg's own paren- depth, then compares adjacent legs across `UNION` / `UNION ALL` / `INTERSECT` / `EXCEPT` operators. The diagnostic anchors on the operator span. Per-depth book-keeping lets chained compound queries inside CTE bodies / subqueries report independently. Function-call argument commas (deeper depth) are correctly ignored. Test totals: 1385 → 1399 passing (+14), 0 failed, 1 ignored. Clippy clean.