{"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-b14u559k","versions":[{"created_at":"2026-06-10T13:18:33Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積93.9㎡(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":"3afbf32a88978a04a0beb1545d96b0a1fba392416c4fe66122f2bad129d3ba24","version":10},{"created_at":"2026-06-10T09:54:17Z","element_count":91,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d51fc01abab72565a9736f1bc6bd924bd07fef07f231b6b4bb29391bc920b65a","version":2}]}