{"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-1mwt47wj","versions":[{"created_at":"2026-06-13T18:49:15Z","element_count":91,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d13d5823b073eb0f4a4569c0a36da202fb694f3242c41fee9722f2808cc476a8","version":3},{"created_at":"2026-06-13T18:42:26Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ab9251984770f316ef0d90ad14336e842cca98bad645ae12e20c19d59ae46219","version":2},{"created_at":"2026-06-13T18:42:22Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}