{"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-c4ojxtj9","versions":[{"created_at":"2026-06-10T13:27:04Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積93.9㎡(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":"b647dd66a9bd2ca3252b8da0ac8849a7f086201481983fd93360a0dab9dc3fed","version":9},{"created_at":"2026-06-10T11:26:44Z","element_count":84,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"08d8adb68b3b97726529b840eb0dafabd9af73366d628d728c369ba81f52e691","version":3}]}