{"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-1j78uql7","versions":[{"created_at":"2026-06-10T13:17:27Z","element_count":77,"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":"725b72b44387680d16a70c0333f8243d580b49dc1cc90c202a9c15802f0d345d","version":10},{"created_at":"2026-06-10T09:54:06Z","element_count":84,"note":"5軸GA polish 59->98 by M5 (autonomous)","saved_by":"mcp","sha256":"e42356744b6df771f837710e5b2fcb96bc60ff09410c80f671192552faef6983","version":2}]}