fix(sdlmerge): pass report pointer as error

graphql-go-tools v2.25.0 moved operationreport.Report.Error to a pointer receiver, so only *Report implements error.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WLmypV3dLndLLzCSpYJHMv

sdlmerge/sdlmerge.go

@@ -50,12 +50,12 @@ func MergeSDLs(SDLs ...string) (string, error) {
 
 	doc, report := astparser.ParseGraphqlDocumentString(strings.Join(rawDocs, "\n"))
 	if report.HasErrors() {
-		return "", fmt.Errorf("parse graphql document string: %w", report)
+		return "", fmt.Errorf("parse graphql document string: %w", &report)
 	}
 
 	astnormalization.NormalizeSubgraphSDL(&doc, &report)
 	if report.HasErrors() {
-		return "", fmt.Errorf("merge ast: %w", report)
+		return "", fmt.Errorf("merge ast: %w", &report)
 	}
 
 	if err := MergeAST(&doc); err != nil {
@@ -81,11 +81,11 @@ func validateSubgraphs(subgraphs []string) error {
 			return err
 		}
 		if report.HasErrors() {
-			return fmt.Errorf(parseDocumentError, report)
+			return fmt.Errorf(parseDocumentError, &report)
 		}
 		validator.Validate(&doc, &report)
 		if report.HasErrors() {
-			return fmt.Errorf("validate schema: %w", report)
+			return fmt.Errorf("validate schema: %w", &report)
 		}
 	}
 	return nil
@@ -96,11 +96,11 @@ func normalizeSubgraphs(subgraphs []string) error {
 	for i, subgraph := range subgraphs {
 		doc, report := astparser.ParseGraphqlDocumentString(subgraph)
 		if report.HasErrors() {
-			return fmt.Errorf(parseDocumentError, report)
+			return fmt.Errorf(parseDocumentError, &report)
 		}
 		subgraphNormalizer.NormalizeDefinition(&doc, &report)
 		if report.HasErrors() {
-			return fmt.Errorf("normalize schema: %w", report)
+			return fmt.Errorf("normalize schema: %w", &report)
 		}
 		out, err := astprinter.PrintString(&doc)
 		if err != nil {
@@ -160,7 +160,7 @@ func (m *normalizer) normalize(operation *ast.Document) error {
 	for _, walker := range m.walkers {
 		walker.Walk(operation, nil, &report)
 		if report.HasErrors() {
-			return fmt.Errorf("walk: %w", report)
+			return fmt.Errorf("walk: %w", &report)
 		}
 	}