{"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-4h2723ww","versions":[{"created_at":"2026-07-05T17:47:01Z","element_count":91,"note":"5軸GA polish 44->95 by M5 (autonomous)","saved_by":"mcp","sha256":"b7ba8960805a974297dce5515288f618c85ea52b28421216dc75e96b37f97a09","version":3},{"created_at":"2026-07-05T17:36:35Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"91a94557346c6af0979bfc048d89e198698bc7c568f6b68d0a23a1aec6325c37","version":2},{"created_at":"2026-07-05T17:36:35Z","element_count":101,"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}]}