{"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-3wz0ng77","versions":[{"created_at":"2026-08-04T19:55:56Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e489a8277648e2f18e6686ca806244f52ce1a17cb3d07c09e45bf5444169b17b","version":2},{"created_at":"2026-08-04T19:55:56Z","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}]}