fix: Remove Babel dependencies to fix Node.js 24 compatibility

[azu]

Summary

• Node.js 24でテストが失敗する問題を修正
• 不要なBabel関連の依存を削除

変更内容

• .mocharc.jsonから@babel/registerの設定を削除
• package.jsonから以下のBabel関連パッケージを削除：
  • @babel/core
  • @babel/preset-env
  • @babel/register

背景

プロジェクトは既にES module形式（"type": "module"）に移行済みのため、Babelによるトランスパイルは不要です。

Node.js 24では、ES moduleプロジェクトでCommonJS形式のrequireを使用すると、より厳格なエラーチェックが行われるようになりました。.mocharc.jsonで@babel/registerをrequireしていたことが原因でテストが失敗していました。

テスト結果

ローカル環境（Node.js 24.5.0）でテストを実行し、すべてのテストがパスすることを確認しました。

ℹ tests 1041 ℹ suites 75 ℹ pass 1041 ℹ fail 0 

🤖 Generated with Claude Code

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[azu]

 [test:basic ] Exception during run: ReferenceError: require is not defined in ES module scope, you can use import instead [test:basic ] This file is being treated as an ES module because it has a '.js' file extension and '/home/runner/work/js-primer/js-primer/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension. [test:basic ] at file:///home/runner/work/js-primer/js-primer/source/basic/condition/test/if/leap-year-flat-example-test.js:3:15 [test:basic ] at ModuleJobSync.runSync (node:internal/modules/esm/module_job:507:37) [test:basic ] at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:441:47) [test:basic ] at loadESMFromCJS (node:internal/modules/cjs/loader:1567:24) [test:basic ] at Module._compile (node:internal/modules/cjs/loader:1720:5) [test:basic ] at Module._compile (/home/runner/work/js-primer/js-primer/node_modules/pirates/lib/index.js:117:24) [test:basic ] at node:internal/modules/cjs/loader:1871:10 [test:basic ] at Object.newLoader [as .js] (/home/runner/work/js-primer/js-primer/node_modules/pirates/lib/index.js:121:7) [test:basic ] at Module.load (node:internal/modules/cjs/loader:1470:32) [test:basic ] at Module._load (node:internal/modules/cjs/loader:1290:12) [test:basic ] at TracingChannel.traceSync (node:diagnostics_channel:322:14) [test:basic ] at wrapModuleLoad (node:internal/modules/cjs/loader:238:24) [test:basic ] at Module.require (node:internal/modules/cjs/loader:1493:12) [test:basic ] at require (node:internal/modules/helpers:152:16) [test:basic ] at Object.requireModule [as requireOrImport] (/home/runner/work/js-primer/js-primer/node_modules/mocha/lib/nodejs/esm-utils.js:94:12) [test:basic ] at Object.exports.loadFilesAsync (/home/runner/work/js-primer/js-primer/node_modules/mocha/lib/nodejs/esm-utils.js:123:34) [test:basic ] at Mocha.loadFilesAsync (/home/runner/work/js-primer/js-primer/node_modules/mocha/lib/mocha.js:451:19) [test:basic ] at singleRun (/home/runner/work/js-primer/js-primer/node_modules/mocha/lib/cli/run-helpers.js:164:15) [test:basic ] at exports.runMocha (/home/runner/work/js-primer/js-primer/node_modules/mocha/lib/cli/run-helpers.js:241:10) [test:basic ] at Object.exports.handler (/home/runner/work/js-primer/js-primer/node_modules/mocha/lib/cli/run.js:379:11) [test:basic ] at /home/runner/work/js-primer/js-primer/node_modules/mocha/node_modules/yargs/build/index.cjs:1:8993 [test:basic ] at /home/runner/work/js-primer/js-primer/node_modules/mocha/node_modules/yargs/build/index.cjs:1:4949 [test:nodecli ] 

この変更で修正された。
なぜかnode 24だけで起きた