{"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-theoldmillhouse-i5qlgpc5","versions":[{"created_at":"2026-06-11T04:23:28Z","element_count":72,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"29c4e2582950292186767525d9a3fb6699af5522a7778fbdc09c07ac7cd03ac8","version":3},{"created_at":"2026-06-11T04:09:56Z","element_count":95,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e90f81ecb64568b266f872618cdd2aaa6c3f3ec634d373f30ceb4b41e9f834f4","version":2}]}