{"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-t3bbuxid","versions":[{"created_at":"2026-06-10T13:18:51Z","element_count":62,"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":"39f6d3fb68a2fcf5d8dc6c99cdb714b6e52cf7389903727b77c21e480854772b","version":10},{"created_at":"2026-06-10T10:09:53Z","element_count":83,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4d617f5d13effa39f72b54c154572d89df4a8cd05c0da07015fb2b8d34e0c025","version":2}]}