{"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-9mhmp54m","versions":[{"created_at":"2026-07-29T01:07:38Z","element_count":130,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"f465bcf04adaf6607fdc0795fa07a5d98404d803301b4538dad6d269f4fec006","version":2},{"created_at":"2026-07-29T01:07:37Z","element_count":130,"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}]}