{"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-1w20owes","versions":[{"created_at":"2026-08-04T06:06:27Z","element_count":83,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ef5708ccf5ef93b11a576c97276c68c06120c8368d330ba1a2251fb017f223b6","version":2},{"created_at":"2026-08-04T06:06:27Z","element_count":83,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}