{"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-eos1iwsq","versions":[{"created_at":"2026-06-10T13:13:10Z","element_count":63,"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":"f6e38f1832accb5d75aa6af6e9b6fba86a61a6bfcceeea91c206e1b3f34159af","version":10},{"created_at":"2026-06-10T09:05:12Z","element_count":84,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c243a0531bf5471f0f1b7683c12b137ec45e18c4d3e3f85a85bafcaa4f171bc8","version":2}]}