{"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-dqzmzfi1","versions":[{"created_at":"2026-06-20T19:55:56Z","element_count":91,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d13d5823b073eb0f4a4569c0a36da202fb694f3242c41fee9722f2808cc476a8","version":3},{"created_at":"2026-06-20T19:43:39Z","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":"9b7b30fd379d8a7cd27a5baff47a54225b2dbe16bd3e17e1011885161361221b","version":2},{"created_at":"2026-06-20T19:43:33Z","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}]}