{"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-eqwrvng4","versions":[{"created_at":"2026-06-11T01:05:13Z","element_count":90,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4a6f55c5b2a3aeb705893729e48ce903a69f2838cc9271acfacafe6882637d34","version":15},{"created_at":"2026-06-10T22:10:33Z","element_count":46,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"3c6bc3dc06bca675bc6f3c2f645d23e4aa915da497b6fcaea4409ca65918f5e1","version":2}]}