{"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-ozf325f4","versions":[{"created_at":"2026-06-10T13:13:00Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積74.1㎡(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":"4586314634af48af1b4417fdd8b8c46463a4edb85dc6485214051e718147e5bf","version":11},{"created_at":"2026-06-10T08:48:53Z","element_count":88,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d670baca2266d8c762c2d424b73d611a55379f28a27f6fbcd1c486a51dd11fde","version":3}]}