{"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-xkqrm6l6","versions":[{"created_at":"2026-06-10T22:57:11Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"bc010fd9563553acd87ccaa315a2b1c3864c386288b21434bd8529ca80548ee1","version":9},{"created_at":"2026-06-10T19:18:47Z","element_count":83,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"176ceb33c3ca8eeed9f468c8d697e33b9c0ad4862f4024a41be531918e749ba9","version":2}]}