Fix REPLACE transformer consuming comma from SELECT clause

When parsing `SELECT * REPLACE expr AS name, other_col` without parentheses,
the REPLACE parser was consuming the comma before breaking, preventing the
caller from seeing there's another select item. Now the comma is only consumed
when inside parentheses.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kyleconroy

parser/expression.go

@@ -3019,11 +3019,12 @@ func (p *Parser) parseAsteriskReplace(asterisk *ast.Asterisk) ast.Expression {
 		replaces = append(replaces, replace)
 
 		if p.currentIs(token.COMMA) {
-			p.nextToken()
-			// If no parens and we see comma, might be end of select column
+			// If no parens and we see comma, this is the end of the REPLACE clause
+			// Don't consume the comma - let the caller handle it for the next select item
 			if !hasParens {
 				break
 			}
+			p.nextToken() // Only consume comma if inside parentheses
 		} else if !hasParens {
 			break
 		}

parser/testdata/02378_analyzer_projection_names/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt67": true
-  }
-}
+{}