{"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-o4bhwrx1","versions":[{"created_at":"2026-06-10T22:52:40Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy87379776→quote19954947 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"a80bc7e03ef7d3bce71ee812bdc86fb1e3fc382dbfff061da3223031c44378ed","version":14},{"created_at":"2026-06-10T15:03:45Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c34ded7d9deab8260befc0008729b31c464a03a92d5f155efa37800143bf6842","version":6}]}