{"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-69pkhb5q","versions":[{"created_at":"2026-06-10T13:45:17Z","element_count":47,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(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":"49b8273294e0fdd539f5a9c33a48208ee3f71c7457b3e241793240a693d04199","version":6},{"created_at":"2026-06-10T13:22:04Z","element_count":56,"note":"5軸GA polish 61->92 by M5 (autonomous)","saved_by":"mcp","sha256":"a1d24a1c4a9979728e4622a23b87fe45472e5cbcec6e2e401424b758035d6726","version":3}]}