{"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-lvxd89vv","versions":[{"created_at":"2026-06-24T19:40:04Z","element_count":91,"note":"5軸GA polish 44->94 by M5 (autonomous)","saved_by":"mcp","sha256":"8ceef7708e94740bf3246152222d0c914d0b4d6d50b321642f480602cf2b58ad","version":3},{"created_at":"2026-06-24T19:32:06Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e9cd028e84fdd01b92f383723571fadbda31a8904461762767bb133c055eb478","version":2},{"created_at":"2026-06-24T19:32:06Z","element_count":86,"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}]}