{"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-sdb54mcw","versions":[{"created_at":"2026-06-30T19:50:48Z","element_count":83,"note":"5軸GA polish 45->96 by M5 (autonomous)","saved_by":"mcp","sha256":"6b5e1b7f50764fa31776d4771378ba669c10a65c36ea7cafbf303ca71e221060","version":3},{"created_at":"2026-06-30T19:39:30Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"6e7a6c5506e85d79c70842349b35b25991e6da1d2327eed44bf6600e507f380c","version":2},{"created_at":"2026-06-30T19:39:30Z","element_count":126,"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}]}