Remove native backend marking for CTEs - let normal indirect processing handle them

Author: claude

internal/stackql/astanalysis/earlyanalysis/ast_expand.go

@@ -843,16 +843,13 @@ func (v *indirectExpandAstVisitor) Visit(node sqlparser.SQLNode) error {
 		cteName := node.Name.GetRawVal()
 		if cte, isCTE := v.cteRegistry[cteName]; isCTE {
 			// This is a CTE reference - create and register an indirect.
-			// CTEs are handled differently from views/subqueries - their SELECT
-			// is already processed when we visit the WITH clause.
+			// The CTE's inner SELECT has already been visited when processing
+			// the WITH clause, so the API tables within it will be processed.
 			indirect, err := astindirect.NewCTEIndirect(cte)
 			if err != nil {
 				return err
 			}
 			v.annotatedAST.SetIndirect(node, indirect)
-			// Mark that we contain native backend material since CTE results
-			// are stored in the SQL backend.
-			v.containsNativeBackendMaterial = true
 			return nil
 		}
 		containsBackendMaterial := v.handlerCtx.GetDBMSInternalRouter().ExprIsRoutable(node)