{"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-j1d95kqd","versions":[{"created_at":"2026-06-11T00:48:54Z","element_count":89,"note":"5軸GA polish 41->97 by M5 (autonomous)","saved_by":"mcp","sha256":"86f86059dbf3735f100306695d966c1ea6c012ea520af8cbba0c3c18de9c67d3","version":15},{"created_at":"2026-06-10T22:06:28Z","element_count":50,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d7571f4178571d17277ca698b7a70164fd0f80882744367f4446d596f4a8503b","version":2}]}