{"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-i5mdi6cs","versions":[{"created_at":"2026-06-10T13:34:16Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積106.2㎡(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":"3f278db60e7de9a4e2f44e27e3c5af3c21c3a639ff168a089850ec1a9b1aef71","version":8},{"created_at":"2026-06-10T12:31:47Z","element_count":90,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4917222c36d885cbc90da1a4cb924c90b4007ed1ebd06952a60b02c7d9caed77","version":4}]}