{"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-ex3upkvu","versions":[{"created_at":"2026-06-10T22:59:07Z","element_count":65,"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":"a4d91b1b6151fd481fd39f7614262e2213a363b1431ee9f7633661dae899c9d6","version":9},{"created_at":"2026-06-10T20:22:39Z","element_count":74,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"9502f82a148fe2c084f1cd21f9c6d3938a08c33d0fcd46b9fdf2dad708ba6727","version":2}]}