{"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-ydjt302k","versions":[{"created_at":"2026-06-11T00:48:31Z","element_count":83,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5420819a262f0fe33a5cc8142e3c387419da6bd5e685b271398d7e6d7f9633cc","version":15},{"created_at":"2026-06-10T22:05:49Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d53c11e547cbc60cac5cc4c38facd055a5c2572695772faf0b948b8d3c7a90d0","version":2}]}