{"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-qh3jon3g","versions":[{"created_at":"2026-06-10T07:25:46Z","element_count":91,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5d5102f0de1d622cc79560c8a2936f46984621b08820ac3e4a5952cb8eeeb88d","version":2}]}