{"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-willowbrookhouse-vzhr2kyo","versions":[{"created_at":"2026-07-13T11:37:22Z","element_count":84,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2bc5160e173d1041dd89fcfd1952cbb131827ea470fd1bcb085c5866a40610dc","version":3},{"created_at":"2026-07-13T11:22:41Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"722af6933647cc9a96522bf11c515b36e8df3ba52947a5b397d82addbe6748b0","version":2},{"created_at":"2026-07-13T11:22:41Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}