{"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-tlebs5no","versions":[{"created_at":"2026-06-10T07:42:32Z","element_count":91,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"753b7c0420beea7f509c99d96491a2bcd1c1772c055eaf449de87383c8269fe6","version":2}]}