{"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-hilltophavenhouse-pj9hcycr","versions":[{"created_at":"2026-06-13T18:05:54Z","element_count":91,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"df503f90f0297ac86bb3f36cb5703997dff2c3917570e33cfbdfdaf604705212","version":3},{"created_at":"2026-06-13T17:49:22Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e3fcba23875e6f0848bb76aa4489f50cb9e3aa334ae37190d6e345419f624798","version":2},{"created_at":"2026-06-13T17:49:20Z","element_count":90,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}