{"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-w2wqhrxk","versions":[{"created_at":"2026-08-14T14:34:25Z","element_count":85,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"512d56cdd7a8b1506d0bd73e3ceea19cfebfbd6d558763108e28bf65981e2dbc","version":2},{"created_at":"2026-08-14T14:34:24Z","element_count":85,"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}]}