{"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-360ztyqt","versions":[{"created_at":"2026-06-11T04:11:06Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"44d7349074360233aefd8d5a18579aa53c6602682ba7440a81079782997da06e","version":2}]}