{"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-willowbrookhouse-bfyg4a7h","versions":[{"created_at":"2026-08-14T23:17:11Z","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":"ba956b0f71ee1271ba1a9430c0426da573df07501147dc947f6b65a5daf387ce","version":2},{"created_at":"2026-08-14T23:17:11Z","element_count":126,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}