chore: pnpm -> yarn

README.md

@@ -5,8 +5,8 @@ Railway Git 入門編リポジトリ
 ## 環境構築
 
 - Node.js v20.15.0
-- pnpm v8.15.3
+- yarn v1
 
 ```shell
-pnpm install
+yarn
 ```

package.json

@@ -8,7 +8,7 @@
   "scripts": {
     "format": "prettier --write {scripts,tests}/**/*.ts",
     "lint": "eslint {scripts,tests}/**/*.ts --fix",
-    "fix": "pnpm run format && pnpm run lint",
+    "fix": "yarn format && yarn lint",
     "test": "vitest run",
     "station04": "ts-node ./scripts/station04.ts",
     "station06": "ts-node ./scripts/station06.ts",
@@ -29,6 +29,5 @@
     "prettier": "^3.3.1",
     "typescript-eslint": "^7.13.0",
     "vitest": "^1.6.0"
-  },
-  "packageManager": "[email protected]+sha512.dd85cd6eca6417c6f73db32ba1eb4767ffb4cba4f5bf0727846722c92b6b9e56a2cc218b11385bbc2b21f18a16a67da77aceae9b61a0f56a1643b25e1fb6a605"
+  }
 }