{"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-ri7gqkmg","versions":[{"created_at":"2026-06-10T22:57:25Z","element_count":85,"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":"aa73a8e10c98d1a03dd0e9ab65c84a94b9f071b7d507d313c6b3f4eaf6cb41f3","version":9},{"created_at":"2026-06-10T19:19:02Z","element_count":73,"note":"5軸GA polish 54->96 by M5 (autonomous)","saved_by":"mcp","sha256":"cb6b2c3441c96c87b718d8cc339606c3d08f2fdbeb6f5b6157f71c936d28a455","version":2}]}