{"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-125xcrem","versions":[{"created_at":"2026-06-13T20:46:43Z","element_count":71,"note":"5軸GA polish 41->92 by M5 (autonomous)","saved_by":"mcp","sha256":"8d3f8b76c4dc23806050121509d9ca724a96eb38f0beeb6d378cf067a671ccaa","version":3},{"created_at":"2026-06-13T20:34:45Z","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":"7cd623f393e16a9ff3b8aae23444a858202d2ceb3a7c07564c40b02063f75a50","version":2},{"created_at":"2026-06-13T20:34:44Z","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}]}