Fix lint errors from CI

- Remove unused `expect` field from parsing test struct
- Replace Fprintf with dynamic format string with os.Stdout.Write

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: schigh

cmd/guid/main.go

@@ -132,7 +132,7 @@ func scanGUID(s string, isJSON bool) {
 			"random":      fmt.Sprintf("%d", g.Random()),
 		}
 		data, _ := json.Marshal(out)
-		_, _ = fmt.Fprintf(os.Stdout, string(data))
+		_, _ = os.Stdout.Write(data)
 		return
 	}
 

guid_test.go

@@ -99,7 +99,6 @@ func TestGUIDX(t *testing.T) {
 		type test struct {
 			name        string
 			str         string
-			expect      GUID
 			expectErr   bool
 			errContains string
 		}