Your task

• Remember a plan by committing it to a file.
• Plans Directory: settings.jsonの plansDirectory を参照する。設定がない場合は {REPOSITORY_ROOT}/docs/plans をデフォルトとして使う
• File name: {YYYY-MM-DD}-{plan-name}.md
• Commit message: [ci skip] Add plan: {plan-name}
• IMPORTANT: do not copy original plan file. move file to the plans directory.