{"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-mm9qj8d5","versions":[{"created_at":"2026-08-02T17:47:38Z","element_count":119,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"da7d137de618061631c5d24b2231c9c079b94cf7928ac9e516c34c275df37dea","version":2},{"created_at":"2026-08-02T17:47:38Z","element_count":119,"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}]}