{"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-hu9ur35d","versions":[{"created_at":"2026-06-10T19:02:38Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b9228c215609066997f831d4b9e364f4602daa32b8b7972873f52bad4d851caa","version":3}]}