{"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-01-culse5r2","versions":[{"created_at":"2026-06-10T23:29:14Z","element_count":47,"note":"","saved_by":"mcp","sha256":"09aa624d8960e182a0330f00f37dc86311e73e59706676c4717b134d39984c78","version":4}]}