Rescue graph building test into subcommand

Sources/apk/Utility/TextFileWriter.swift

@@ -1,29 +0,0 @@
-/*
- * darwin-apk © 2024 Gay Pizza Specifications
- * SPDX-License-Identifier: Apache-2.0
- */
-
-import Foundation
-import Darwin
-
-struct TextFileWriter: TextOutputStream {
-  private var _hnd: FileHandle
-
-  init?(_ to: URL) {
-    let file = open(to.path(), O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, 0o644)
-    guard file >= 0 else {
-      return nil
-    }
-    self._hnd = FileHandle(fileDescriptor: file, closeOnDealloc: true)
-  }
-
-  mutating func write(_ string: String) {
-    if let data = string.data(using: .utf8) {
-      try? self._hnd.write(contentsOf: data)
-    }
-  }
-
-  mutating func close() throws {
-    try self._hnd.close()
-  }
-}