{"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-2uuiyna3","versions":[{"created_at":"2026-06-19T06:16:45Z","element_count":73,"note":"5軸GA polish 44->96 by M5 (autonomous)","saved_by":"mcp","sha256":"8706c08e117379a8e905b65ed96c71191156a8b9abdc085b9a881805046b4983","version":3},{"created_at":"2026-06-19T06:04:28Z","element_count":89,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e9b432fd7827a4491ca7c0824ab44ad7979ec52b315f670f30571a4aef733b49","version":2},{"created_at":"2026-06-19T06:04:27Z","element_count":89,"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}]}