{"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-xl3yuddy","versions":[{"created_at":"2026-06-10T22:58:10Z","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":"1db93345967ace114f3b4c7c5ca9e75d54ed7ded7e52f06bfcaf32e23e4e70d5","version":9},{"created_at":"2026-06-10T19:50:33Z","element_count":89,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"5708b6bad2878f0edb12f054885d6f1fbcb14419d5c8b075ad520644dc5ae6fe","version":2}]}