{"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-eq5klsmm","versions":[{"created_at":"2026-06-10T13:34:17Z","element_count":65,"note":"backfill: 延床=居室床スラブ実面積93.5㎡(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":"bd7e12e3ee82c4bcd6cff85e2897ed28f08d6fd6208ed6996023646b88a6d8fa","version":8},{"created_at":"2026-06-10T12:31:45Z","element_count":83,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"f57a9c444f4ac693c0f7c2a79b56e221f235bf4cf790f4fe81a1f7559d99ead9","version":4}]}