{"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-ovalhillhouse-2qanakvi","versions":[{"created_at":"2026-08-03T06:50:35Z","element_count":119,"note":"loop3: 設計時延床 48.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"65a737b19f493ccc3adacad8e49fd3bb200de36c96ec895cbfa36bac5677e013","version":2},{"created_at":"2026-08-03T06:50:35Z","element_count":119,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}