{"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-50rqd6dp","versions":[{"created_at":"2026-06-10T22:57:04Z","element_count":66,"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":"115d220678a9375a3aa09b6eeff9c2d0802e9886a0cf442e1f935e82d5bc4c06","version":9},{"created_at":"2026-06-10T19:02:37Z","element_count":72,"note":"5軸GA polish 60->93 by M5 (autonomous)","saved_by":"mcp","sha256":"fa04c82390b47aec66f17689394eaa3fee71d5f001691af1f25b9344cdc5a39d","version":2}]}