{"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-r9grrgqo","versions":[{"created_at":"2026-06-10T23:01:18Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / jpy96334560→quote22448917 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"6b1c5ec7c47a258da5b3a10f8211269a953ca9a0ea03d1eefa7c574b6ad06b6f","version":9},{"created_at":"2026-06-10T22:16:58Z","element_count":72,"note":"5軸GA polish 54->96 by M5 (autonomous)","saved_by":"mcp","sha256":"b545f31e441b8821779d5709581b890b4c28721c8c4bb34f5fa082956e2d6996","version":4}]}