anchor.diff:  
     /// The root of the sky_engine package.
     skyEnginePath,
  -  /// The location of the macOS engine podspec file.
  -  flutterMacOSPodspec,
   
     // Fuchsia artifacts from the engine prebuilts.
     fuchsiaKernelCompiler,
  
positive.code:       case Artifact.constFinder:
        case Artifact.flutterFramework:
        case Artifact.flutterMacOSFramework:
        case Artifact.flutterMacOSPodspec:
        case Artifact.flutterPatchedSdkPath:
        case Artifact.flutterTester:
        case Artifact.flutterXcframework:
  
negative.code:       return '';
      case Artifact.skyEnginePath:
        return 'sky_engine';
      case Artifact.fuchsiaKernelCompiler:
        return 'kernel_compiler.snapshot';
      case Artifact.fuchsiaFlutterRunner:
  