{"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-3w7nnvdm","versions":[{"created_at":"2026-06-10T22:52:31Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / jpy72816480→quote20168591 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"3caf288d0359ea2944bac298188377cd0a2e72e4d31dbf2827e803632eca3bbb","version":20},{"created_at":"2026-06-10T13:34:50Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積78.3㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"ecb25cf1e0d34bf9098174b3f64aa347a840e591701f51ec17c38517f99508f2","version":7},{"created_at":"2026-06-10T12:48:49Z","element_count":85,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b47224fc50ebffbc429b6bcfc88475959979dc745829ca7ea2ca85c9c4f94df0","version":4}]}