Decision Insurance（Unlisted / 無料）を公開。 意思決定を「最大損失 → 破綻3 → ヘッジ → 判定＋次の一手（固定順）」で短時間に整理。 Released: Decision Insurance (Unlisted / free). Fixed order: max loss → 3 failure modes → hedge → verdict + one next step. Tools hub: https://github.com/shin4141/decision-os-paper/blob/main/notes/tools.md