{"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-middletonridgehouse-48mxeok3","versions":[{"created_at":"2026-06-10T13:22:36Z","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":"2026-06-10T10:23:23Z","element_count":72,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"cc54f3acfc0fb63592652026a0ae5f08eafd76ed6a8856807fd7a187fd9d4b89","version":2}]}