{"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-cwt89rol","versions":[{"created_at":"2026-06-11T03:57:27Z","element_count":85,"note":"5軸GA polish 42->95 by M5 (autonomous)","saved_by":"mcp","sha256":"1e2c4248e5ad63dceabed34ba6fe14604a3258e87cd3df2f224300776b0fec26","version":3},{"created_at":"2026-06-11T03:44:24Z","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":"01bbf58d1ea71bc34dbf123c063af8a9e968c2202832b68a0c21fc4e55580247","version":2}]}