{"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-74qjm47z","versions":[{"created_at":"2026-08-04T19:27:56Z","element_count":84,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"943ce45c0b9ff13b5faa5d3c2c5e3dd10a10363bcaa88306ec043818e7d8a7fd","version":2},{"created_at":"2026-08-04T19:27:56Z","element_count":84,"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}]}