{"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-qc3l88g0","versions":[{"created_at":"2026-06-11T00:31:36Z","element_count":74,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"8f72926050753adf3700d8c992a370813cd808f125fd8f1b11feded9c125e4b5","version":15},{"created_at":"2026-06-10T21:51:02Z","element_count":54,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"db57a521db4fd9efe7664f54567530dc200c577707199ef155930ae3127e4541","version":2}]}