{"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-2za8ooo7","versions":[{"created_at":"2026-06-10T13:24:16Z","element_count":65,"note":"backfill: 延床=居室床スラブ実面積106.2㎡(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":"7150b11cdabbc5afa34b648c77c2451204da7e3c0b4bb9c993d3a5ff01e7f7a9","version":10},{"created_at":"2026-06-10T10:53:20Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"e85b32665e8d1d680c478cb83980a33ccce2ddc8f6bf855bf311a023fdc5fe4d","version":3}]}