{"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-wxn7e5am","versions":[{"created_at":"2026-06-10T22:58:39Z","element_count":85,"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":"36a7d09ea041f65f6178334661451957ce41d4760e93920a4a3cbdb4c2368834","version":9},{"created_at":"2026-06-10T20:07:32Z","element_count":70,"note":"5軸GA polish 54->93 by M5 (autonomous)","saved_by":"mcp","sha256":"f0f5eb160a3412edded245e3b0b5ce68b0e45353d0204fa17ca62ead580f1410","version":2}]}