{"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-0cj19gzo","versions":[{"created_at":"2026-06-10T23:05:58Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy90050184→quote20954809 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"1bdca4f1965f989d97326ec837b285140ccc7a5d1a7c1cd19b66bf28b47c0b92","version":9},{"created_at":"2026-06-10T22:17:49Z","element_count":90,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"591519640fb3e5c9168fe0d0c9b25eb8094051a74fba26b434c9491104ceb8f8","version":4}]}