{"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-ktzpgf36","versions":[{"created_at":"2026-06-11T00:49:02Z","element_count":90,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"618f2ffb48817711a2ab9893060d7d51ac24e952d27f183f7394ca85a9ab1e78","version":15},{"created_at":"2026-06-10T21:57:24Z","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":"f7a0cd39b2859088cf8f0dab743d0438b86b92154614b47ebf1c5941be4927cc","version":2}]}