{"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-90trfnr1","versions":[{"created_at":"2026-06-11T00:31:35Z","element_count":71,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"569c30000cd3ce15e71d126e59b8d39ec2af000f4a51d4d05df2b01d11347374","version":15},{"created_at":"2026-06-10T21:53:10Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"583c74e5053b3905fe51a375ee37b193af1d66eac12005461c8d6d7eda47062c","version":2}]}