{"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-ql3h8v20","versions":[{"created_at":"2026-06-10T13:12:01Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積74.1㎡(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":"725b72b44387680d16a70c0333f8243d580b49dc1cc90c202a9c15802f0d345d","version":11},{"created_at":"2026-06-10T08:32:55Z","element_count":91,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"fe08524333bd732ca0ec9f9d1d0ce8b22320a1396235b44af503cc27cf744894","version":3}]}