Fix CRLF line ending comparison in explain tests

Normalize CRLF to LF when reading expected explain output files since
some files may have Windows line endings.

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

Author: kyleconroy

parser/parser_test.go

@@ -270,6 +270,8 @@ func TestParser(t *testing.T) {
 					// Check explain output if explain file exists
 					if expectedBytes, err := os.ReadFile(explainPath); err == nil {
 						expected := strings.TrimSpace(string(expectedBytes))
+						// Normalize CRLF to LF (some expected files may have Windows line endings)
+						expected = strings.ReplaceAll(expected, "\r\n", "\n")
 						// Strip version header comment (e.g., "-- Generated by ClickHouse X.X.X.X")
 						if strings.HasPrefix(expected, "-- Generated by ClickHouse ") {
 							if idx := strings.Index(expected, "\n"); idx != -1 {

parser/testdata/01073_crlf_end_of_line/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt6": true
-  }
-}
+{}