{"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-x7nlv6ju","versions":[{"created_at":"2026-06-10T13:16:30Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(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":"baa5cdafa96455346e94893a41c033b0110cfb2f0b6e82bf7a70f56d7b645ff2","version":10},{"created_at":"2026-06-10T09:54:05Z","element_count":72,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"93893e2a67e7a728ebf2b80a31e59f22dc2f62ce6dc6707bb1feeef4a916d7ec","version":2}]}