{"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-vtc4qvtq","versions":[{"created_at":"2026-06-10T22:57:15Z","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":"192a2ad2124ade76af6535732656ebeaed7e6f6da6c94cc6732ae99abdcc9283","version":9},{"created_at":"2026-06-10T19:18:45Z","element_count":69,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"bad1d768c1a85129b14e686677ddd3d1c0158098d3adbe535f3c53e0827d883a","version":2}]}