{"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-jp2wz0nm","versions":[{"created_at":"2026-06-11T00:48:51Z","element_count":85,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5aa8dfbb1cb3430d5481d4f05baaea6cd44de8692cc0475d8bb0d6141c8954e9","version":15},{"created_at":"2026-06-10T22:04:36Z","element_count":47,"note":"loop3: 設計時延床 80.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"444c43c09b69d96f8afd66d54f5bbe3721b825b56712b74c85c2d4414547367f","version":2}]}