{"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-t2b3mrg1","versions":[{"created_at":"2026-06-13T22:46:01Z","element_count":83,"note":"5軸GA polish 43->95 by M5 (autonomous)","saved_by":"mcp","sha256":"1f8e331c755549b83f6cabe829f9aade564a371f3941efb0958215dd6e14e622","version":3},{"created_at":"2026-06-13T22:38:09Z","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":"997ab5c86e3384f7e7d158cbd233d5d78d5f06254c64a6a85bd95554ccad70d6","version":2},{"created_at":"2026-06-13T22:38:09Z","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}]}