{"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-am3ep2l1","versions":[{"created_at":"2026-08-04T19:43:59Z","element_count":86,"note":"loop3: 設計時延床 78.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e1f80befd72172be5ed8b4807a06e213ea67f9b6529a39e725f38865c0522bc0","version":2},{"created_at":"2026-08-04T19:43:59Z","element_count":86,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}