{"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-pm8cfxso","versions":[{"created_at":"2026-06-10T18:13:46Z","element_count":83,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"47ef2f40f737c472599f90ddbf1f6e5136b8c9e4f2f30d276860ffa6e96f5b62","version":3}]}