{"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-o7mosyh5","versions":[{"created_at":"2026-06-29T19:50:45Z","element_count":71,"note":"5軸GA polish 40->92 by M5 (autonomous)","saved_by":"mcp","sha256":"1be2dab6425119d131172b3b17cd3f9d6e21ba5f48d176003f53e5126c152854","version":3},{"created_at":"2026-06-29T19:34:56Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8596ad188a271af66628e150c7bff0cdbac1441302f8464fd1151434694a03ab","version":2},{"created_at":"2026-06-29T19:34:56Z","element_count":119,"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}]}