コードチェック強化: format, typecheck追加, eslintにtestsディレクトリを対象に加える

[nemuvski]

標題のことに加えて、GitHub Actionsワークフローにそれぞれの静的解析の実行を組み込みました。

#93 のブランチにマージします。

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch enhance-ci

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[dc7290]

LGTM！