{"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-vpiansnr","versions":[{"created_at":"2026-06-11T01:57:03Z","element_count":72,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"9bccdd4dcee80ecf5dcde653206f1c1115c54d1dbb530ad33fa2b6400e650352","version":5},{"created_at":"2026-06-11T00:37:31Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"22a63be82d9edb94dd6ae46adfe1dc8765bc3e08db6f8b98675a4347d3906d26","version":2}]}