{"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-05-kuc0vblv","versions":[{"created_at":"2026-06-10T23:29:37Z","element_count":50,"note":"","saved_by":"mcp","sha256":"df54550686138aa81f114d55c5fa3d927a5c252385485e246fdac7ea47101dfb","version":4}]}