{"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-jsr3nj6r","versions":[{"created_at":"2026-06-10T07:25:39Z","element_count":89,"note":"5軸GA polish 59->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1c2ea5b6ea22489b48eaab2883fb13657bcaf47c3c2f5898a57ce674e086e4bc","version":2}]}