{"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-lkffklpg","versions":[{"created_at":"2026-06-10T16:55:05Z","element_count":71,"note":"5軸GA polish 60->92 by M5 (autonomous)","saved_by":"mcp","sha256":"764f711d97cfb1bae1e235bf1b4c14237107db8b9adaf9de2f5df679c3704117","version":2}]}