{"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-f7cldh0z","versions":[{"created_at":"2026-06-10T22:52:30Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy85444799→quote20039150 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"3cf17e14e10ae027856c4b2b9b544044b23d4aeecdf935604652994eb839ded0","version":21},{"created_at":"2026-06-10T13:34:20Z","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":"28d69fe6ea73689d2523a349843f3a1b32867303bf5a19b1c0807d376572651a","version":8},{"created_at":"2026-06-10T12:31:46Z","element_count":72,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"cd1575125805f85a54a115ca107ae3bdf364c47b37a2c581adc88439ebd9300d","version":4}]}