{"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-ray32nm8","versions":[{"created_at":"2026-06-11T03:43:51Z","element_count":90,"note":"5軸GA polish 45->95 by M5 (autonomous)","saved_by":"mcp","sha256":"268a98a77d5959da1653063e5fe2c955bb2fc64a8d81c6f375f587eb1cb1ee2e","version":3},{"created_at":"2026-06-11T03:33:21Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ec962626939aa8f48e08a84eb8cd8c6cdcfa8ee4eac2a68d361961b09abb08b1","version":2}]}