{"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-0jjkv3ff","versions":[{"created_at":"2026-06-10T18:46:38Z","element_count":83,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"b0b5065ca2d7f69d9773ac54ade33efb2a3a7f75d9b12f6824771284cb2058bf","version":3}]}