{"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-y3jz7y7k","versions":[{"created_at":"2026-06-10T22:52:49Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"47fa1a5504c2a92b7072dbd63d13128b2e9878fb87e7ea117d258f0c64f15fba","version":10},{"created_at":"2026-06-10T16:39:10Z","element_count":83,"note":"5軸GA polish 54->95 by M5 (autonomous)","saved_by":"mcp","sha256":"2e2b4827dd921c80cbb9444b0306bb2f023f7d0e7617e5726adbbe16c8bc04a9","version":2}]}