{"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-9mj4o2tq","versions":[{"created_at":"2026-06-10T13:25:31Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.3㎡(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":"6c21ddd163d179c20d15f8feb9f4d9decd06fbd1fb73ba078212aa8519a3ab46","version":11},{"created_at":"2026-06-10T11:10:03Z","element_count":74,"note":"5軸GA polish 61->96 by M5 (autonomous)","saved_by":"mcp","sha256":"1106226324a2efc915d0c485ac556deb37ebe1c0281f48d68c66240b1c4d3f54","version":4}]}