{"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-willowbrookhouse-zcjvjywm","versions":[{"created_at":"2026-07-28T06:34:53Z","element_count":86,"note":"loop3: 設計時延床 50.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"beb1200a526294ec6585cc2bf8d49f0947051424b6de2a6278abafb111346fad","version":2},{"created_at":"2026-07-28T06:34:53Z","element_count":86,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}