{"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-gentleoakbungalow-lhm95asl","versions":[{"created_at":"2026-06-10T22:53:52Z","element_count":77,"note":"legacy fix: jpy72816480→quote20180810 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"dcc79433bbcee2ea265401a966fc6439c21986f3347d1ddf011a2db3613a5267","version":10},{"created_at":"2026-06-10T17:08:53Z","element_count":83,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5fd776ccc2b8c4b04f43e5610741de59bc6bee0ad29109229ccbf45ab3024242","version":2}]}