{"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-0yedbm2h","versions":[{"created_at":"2026-06-11T01:39:33Z","element_count":73,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"f3f69b0ca9b3d6940dba35eb7ea6c05a748728243380495392d10e66567a8ed0","version":11},{"created_at":"2026-06-10T23:10:56Z","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":"c13cf96bdc1717ea3bdeb9c1a0074efc190a37a5024140aeeb80a243e9766b8b","version":2}]}