{"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-243gmi4a","versions":[{"created_at":"2026-06-11T00:31:36Z","element_count":73,"note":"5軸GA polish 47->96 by M5 (autonomous)","saved_by":"mcp","sha256":"428e80028ec55edb915729fdac8dc887865ec346026a849b17014469f81fd4c4","version":15},{"created_at":"2026-06-10T21:53:49Z","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":"d4f40924aaf0795c3e0b334671bed01ec391d835b62e4d7b93b9132b11d6fb52","version":2}]}