{"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-z9yomwiz","versions":[{"created_at":"2026-06-10T18:29:58Z","element_count":91,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"10ae9ee9ae62589a966668d8bf68a96cc6b476da96ff2163e50dda14eb2004e2","version":3}]}