{"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-d5z2lmvu","versions":[{"created_at":"2026-06-10T22:52:37Z","element_count":65,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy90050184→quote21693331 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"83822c1d0c21e5077706e4f93f765177ceff33cd9f2de516d6f753b16a34266f","version":17},{"created_at":"2026-06-10T14:13:32Z","element_count":91,"note":"5軸GA polish 55->98 by M5 (autonomous)","saved_by":"mcp","sha256":"8093451737d024765f59fa14eb9cfd898895c7928e379ae1261d60e5fbe1805f","version":6}]}