{"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-n4rawzd1","versions":[{"created_at":"2026-06-22T19:27:04Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2b98733c947b56e3142a2b6675879d2bfd1d3e2bef29e2a22d35bcf63434b9b5","version":3},{"created_at":"2026-06-22T19:25:07Z","element_count":87,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"604431992e18478bae550db3004fc91f542e950483ea16692487c4c0d3203667","version":2},{"created_at":"2026-06-22T19:25:07Z","element_count":87,"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}]}