{"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-1j9u4u4i","versions":[{"created_at":"2026-06-10T13:12:59Z","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":11},{"created_at":"2026-06-10T08:48:47Z","element_count":90,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"bbda0b66625f5d80c2c7372c1fe8201d67d8221745d146fb53785d408c8682b2","version":3}]}