{"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-friernbarnethouse-bx29bdl7","versions":[{"created_at":"2026-06-10T13:11:01Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積93.5㎡(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":"0e06e24b0f100298d5bd6afbb0b9ccbf2c306c7f34ac1c3460a7585e8761d09e","version":11},{"created_at":"2026-06-10T08:15:29Z","element_count":83,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"723bc301c22ad8b64f609b189d3851c65c2abbe996b7e01216be8b24724a0edb","version":2}]}