{"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-ehbiqcfm","versions":[{"created_at":"2026-06-10T15:53:05Z","element_count":72,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"794d72307761948d2c00296113fd31253d73253157c79fb1e7289c3af0ca5d51","version":3}]}