{"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-oq46omnb","versions":[{"created_at":"2026-06-11T04:23:39Z","element_count":83,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2cebdd09d8ae4623d557b8be3b87a7a4880e0e250c8854e49062eea063fbde94","version":3},{"created_at":"2026-06-11T04:09:34Z","element_count":117,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"7cc808abdb080d3fab7d584ac6aa68ed8cf4a683ae8cbaa9a579d53c67f5bbba","version":2}]}