{"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-m1xusc96","versions":[{"created_at":"2026-06-10T14:29:25Z","element_count":73,"note":"5軸GA polish 61->96 by M5 (autonomous)","saved_by":"mcp","sha256":"133db49c8ee7fe93e6b314536b0a72d26bf9717c9470eca45c0d808a4b3114f3","version":6}]}