{"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-vpo2ip4l","versions":[{"created_at":"2026-06-11T00:48:35Z","element_count":85,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d9257d855604f2621280c7429c1badead29edc70384c80f969c88b7402ccd6a2","version":15},{"created_at":"2026-06-10T21:56:10Z","element_count":47,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"cbae3289b32cf5326daccd4a80f8de1d4c3f2ce2a79f5f0374f7a9622f963538","version":2}]}