{"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-z002bm0y","versions":[{"created_at":"2026-08-01T12:06:19Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"4ac05749b62976c422f763d3956c6bacdd6aa6f6dcb0c208f5b503ca42645f12","version":2},{"created_at":"2026-08-01T12:06:18Z","element_count":88,"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}]}