{"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-lzuwtym1","versions":[{"created_at":"2026-06-10T13:55:47Z","element_count":74,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"68be66ec3e5a4a439afaf056f4748d04b54e88cea685560c2aa45b6f8fee8db0","version":6},{"created_at":"2026-06-10T13:45:28Z","element_count":50,"note":"backfill: 延床=居室床スラブ実面積74.1㎡(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":"85bcf7ed901f4d8505b6de22343206130aa9ecc57013ec4f8445d59a65cd89e6","version":5}]}