{"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-willowbrookhouse-fvspm7bz","versions":[{"created_at":"2026-07-16T18:04:52Z","element_count":89,"note":"5軸GA polish 38->92 by M5 (autonomous)","saved_by":"mcp","sha256":"abc820a9faecd98aaf64f0b7d8927141fbf69a8810bfc705177a56578f6ba88b","version":3},{"created_at":"2026-07-16T17:54:38Z","element_count":82,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"a560d939d864735162ea69f1f93bc92fb76c9a4c2dc06e16cd818a6b86aef5b1","version":2},{"created_at":"2026-07-16T17:54:37Z","element_count":82,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}