{"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-kd301dz0","versions":[{"created_at":"2026-06-10T18:29:57Z","element_count":72,"note":"5軸GA polish 56->96 by M5 (autonomous)","saved_by":"mcp","sha256":"053a0da5abf79982d1e8a7f9ffbfc54a854dc2875ea9f17843c77a3f44126aaf","version":3}]}