{"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-2cbs2c3u","versions":[{"created_at":"2026-06-10T16:08:49Z","element_count":72,"note":"5軸GA polish 56->97 by M5 (autonomous)","saved_by":"mcp","sha256":"fd20711622a1d0fdca724bed3369df10d29784b2a2e75c2f51f2929d9bc1c883","version":3}]}