{"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-dn6f5yy3","versions":[{"created_at":"2026-06-10T14:13:16Z","element_count":74,"note":"5軸GA polish 66->95 by M5 (autonomous)","saved_by":"mcp","sha256":"60c0101e542d98d215954108c97f8f6a6ee8606581800f4fc502c1d15b55d8a5","version":7},{"created_at":"2026-06-10T13:46:58Z","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":"6f49185ca59dda6ba0de28aa94876d4bcb9d989189d43f88fc2c79dffd84eb53","version":4}]}