{"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-mek2p382","versions":[{"created_at":"2026-06-10T22:53:28Z","element_count":63,"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":"e9c964f70b961731bc436b6433a25986ad5daca5eb45ca50716c900db23ee20f","version":10},{"created_at":"2026-06-10T16:55:13Z","element_count":91,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"3aeb3bb9bb844069d7968929d630a935729cf6db459c30f5e4faa8abc3507505","version":2}]}