{"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-8a2zna0j","versions":[{"created_at":"2026-06-10T16:40:26Z","element_count":90,"note":"5軸GA polish 54->96 by M5 (autonomous)","saved_by":"mcp","sha256":"f349a926e240d67af68d0ff06985281b66572fc1b7f7ef8ddc2782b1a1e41d4a","version":2}]}