{"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-vdxsw754","versions":[{"created_at":"2026-06-11T01:22:19Z","element_count":56,"note":"5軸GA polish 47->92 by M5 (autonomous)","saved_by":"mcp","sha256":"024176411e702a26ee11665485342192bfe8f83ce457c464503567c245015b86","version":11},{"created_at":"2026-06-10T22:52:25Z","element_count":47,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ba6d04d20bd4703447503a3030f9fa951333726578567ce483bea56c22797a53","version":2}]}