{"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-watergatehouse-saz4wou6","versions":[{"created_at":"2026-06-13T17:52:44Z","element_count":73,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"c4f3dfcef50480525562662adf326f4a6b14e4d8fb35f09231e36c1baf9a200e","version":3},{"created_at":"2026-06-13T17:44:40Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1cf77b4aeaa15792e7a08a1f96ffa0238fa0327b122e76c21f5b271c5bbb09f1","version":2},{"created_at":"2026-06-13T17:44:37Z","element_count":90,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}