{"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-gh5e5cp9","versions":[{"created_at":"2026-06-10T22:53:06Z","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":"7e6098a11a840d2517deee712520f7d40e5f83adbe11710ec6368ac31f3f325c","version":10},{"created_at":"2026-06-10T16:38:57Z","element_count":83,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"67a12e2ff5433514dc89e65e3ba8979d8879a39dd3e0bb32dfaf80ba398d68eb","version":2}]}