{"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-pioryjpk","versions":[{"created_at":"2026-06-10T14:29:45Z","element_count":72,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"40fcf23793b1d02e62f621f52cf622d8db4f96df01a151b4f249754cfa102268","version":6}]}