{"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-0a0id246","versions":[{"created_at":"2026-07-31T19:24:00Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"7bf05e2b5b2aa3576e90bf4c87770e63fc8543357b562de92118f03a85061962","version":2},{"created_at":"2026-07-31T19:24:00Z","element_count":126,"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}]}