{"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-larchfieldbungalow-67huqwb0","versions":[{"created_at":"2026-06-29T17:44:32Z","element_count":88,"note":"5軸GA polish 38->92 by M5 (autonomous)","saved_by":"mcp","sha256":"41fd90be3c2eafcd30f0db70ab6321e21e945cba30698ce434e8b89dee4d57b4","version":3},{"created_at":"2026-06-29T17:31:45Z","element_count":101,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"6533cd2cc3d7caa0b4e7033172fe62e56ea51d4e1edcc235c0df609ba2f08246","version":2},{"created_at":"2026-06-29T17:31:45Z","element_count":101,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}