{"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-hortonvalehouse-4z9kvtza","versions":[{"created_at":"2026-06-10T13:11:03Z","element_count":62,"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":"6db074f3d81b45f596c0062c5efbc2318f54fe318af5240540177059f0075ae0","version":11},{"created_at":"2026-06-10T08:15:50Z","element_count":89,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"627d4323537860d20f9537cbca549bd82032f796617fc7baca8ecdd452b17170","version":2}]}