{"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-n42xy6zk","versions":[{"created_at":"2026-06-10T13:11:45Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積93.9㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"bfcaba9f307b08e6453d54aec58ecc6407caa3d4acbc06a705d0648b3f0d3bc5","version":11},{"created_at":"2026-06-10T08:33:10Z","element_count":90,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d4449140a275b8d7f8da84e2cbe0df76b74e024b1a984938ead48d3125e64690","version":3}]}