{"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-s5jxxhp6","versions":[{"created_at":"2026-07-13T09:38:58Z","element_count":74,"note":"5軸GA polish 45->93 by M5 (autonomous)","saved_by":"mcp","sha256":"d999e172be22567127722d2c18ab7a135f60908e07f292816cd7c44c5358fe45","version":3},{"created_at":"2026-07-13T09:30:57Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"766fbf02cf24455d1cf72749a69d03af54ee38531133badf69f478ae1debfac5","version":2},{"created_at":"2026-07-13T09:30:57Z","element_count":126,"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}]}