{"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-highbarnethouse-6w3njs9e","versions":[{"created_at":"2026-07-20T06:18:53Z","element_count":84,"note":"5軸GA polish 38->92 by M5 (autonomous)","saved_by":"mcp","sha256":"644c606396a8b23b101129451c333d173cae13e8cd9af2956d135667d63d5a05","version":3},{"created_at":"2026-07-20T06:06:04Z","element_count":119,"note":"loop3: 設計時延床 50.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8cdd23cac863ff46b19a7e340dca870b92a55f3ad5163b76ed6ec61a9b25f587","version":2},{"created_at":"2026-07-20T06:06:04Z","element_count":119,"note":"言葉から生成: LDK+main bedroom+kids room+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}