{"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-5u13l8sy","versions":[{"created_at":"2026-08-04T19:57:23Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"94565a79518e67241ec4be8f7caf29e5d1dee8af56ac66c43d837ce9f38b8609","version":2},{"created_at":"2026-08-04T19:57:23Z","element_count":134,"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}]}