{"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-6zq46ah1","versions":[{"created_at":"2026-06-10T22:52:52Z","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":"74f8d394e59a19b09a5299e9376284735bcf576756fae8568217d4b110a0ffc0","version":10},{"created_at":"2026-06-10T16:40:23Z","element_count":91,"note":"5軸GA polish 56->95 by M5 (autonomous)","saved_by":"mcp","sha256":"4cd78a634509ac002572f4141497b498cf11115f9032c63fd1080a55a4fb3749","version":2}]}