{"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-njnhqzwv","versions":[{"created_at":"2026-06-10T13:26:49Z","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":"3a04a443f0b9dea562d92b80be236a7db271ddb46a097b2da7a2c472bab12689","version":9},{"created_at":"2026-06-10T11:26:46Z","element_count":73,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"df824287e5ff0cc57375ddf197fabc882ff47b4309fa0f5c7eb13628291ef213","version":3}]}