{"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-19ld7y6k","versions":[{"created_at":"2026-06-11T03:44:00Z","element_count":72,"note":"5軸GA polish 42->93 by M5 (autonomous)","saved_by":"mcp","sha256":"c32c2c711d0535044346a42b80b0dfbacbb3876d53d9e06a6cd2446a24c111a1","version":3},{"created_at":"2026-06-11T03:31:11Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"3e05da30b23606dcfc42e4ec70a665461db7708dc90a5b16333942b738952a23","version":2}]}