{"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-ej1jsot1","versions":[{"created_at":"2026-06-10T19:50:44Z","element_count":73,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"91c3208e5b627989c9db186244e152b02ea94544e97de717078c9cc310935cad","version":2}]}