{"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-willowbrookhouse-ximbypgo","versions":[{"created_at":"2026-06-10T22:53:54Z","element_count":77,"note":"legacy fix: jpy48570969→quote22740658 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"844c46775332ed88e07158d72bc1a4ac71cf1d6dd844d91bc914d9e59fa895a0","version":10},{"created_at":"2026-06-10T17:23:07Z","element_count":84,"note":"5軸GA polish 43->93 by M5 (autonomous)","saved_by":"mcp","sha256":"9374b0da9a91a5d94f925e5d35811fc17a4e3b831e9c0cfd7021f865b3547c1f","version":2}]}