{"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-n4un3689","versions":[{"created_at":"2026-06-11T01:38:46Z","element_count":84,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"f2689394829d1a2e147c5dbfddeeb3b9da43cb398db2d951c7f76054f6641a3d","version":11},{"created_at":"2026-06-10T23:06:29Z","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":"dc0002d56b79e1afc9ee2f02aedd1cd21998ae2ef35a9ee6dda46801bab40d46","version":2}]}