{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-0o0tfmdm","versions":[{"created_at":"2026-07-01T19:38:31Z","element_count":142,"note":"言葉から生成: 総2階(箱) / ガレージハウス・愛車3台・趣味室","saved_by":"mcp:create","sha256":"","version":1}]}