{"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-tramwayshoused06-0dpj1y8w","versions":[{"created_at":"2026-07-14T13:25:52Z","element_count":88,"note":"5軸GA polish 38->92 by M5 (autonomous)","saved_by":"mcp","sha256":"2698e3ed78ca51de15435ef626fa5e6a17e1111619a934b5bca4e661fe6f1eb9","version":3},{"created_at":"2026-07-14T13:20:00Z","element_count":101,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"27ad7741348fa824c1ef9316911a609f53b68d04fc877d10040ff22b5df72f62","version":2},{"created_at":"2026-07-14T13:20:00Z","element_count":101,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}