{"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-sos51qrh","versions":[{"created_at":"2026-06-30T06:32:18Z","element_count":83,"note":"5軸GA polish 41->94 by M5 (autonomous)","saved_by":"mcp","sha256":"14f02dc382f6bfbf74c08756e1e5f33df38789142a35fdfcc1baf1c14b4d8b1b","version":3},{"created_at":"2026-06-30T06:19:14Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"4244e03995f1fa65762501caa65562ae9c35f07f90623cddcfad24e5855f4a82","version":2},{"created_at":"2026-06-30T06:19:14Z","element_count":86,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}