{"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-wjwddwb2","versions":[{"created_at":"2026-06-10T13:24:23Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.7㎡(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":"b663a9ddc809097fec5c82d3c11646dc782da12bff08bcb63f4206c12b4beda3","version":10},{"created_at":"2026-06-10T10:53:11Z","element_count":73,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"cd9ff3bc379d7a4d84c5a93aba49012fea9377c7f54ba88f3e22d2d0f7ea1904","version":3}]}